CN112334040A

CN112334040A - Shoulder bag

Info

Publication number: CN112334040A
Application number: CN202080002731.3A
Authority: CN
Inventors: 若生然太; 泽田隆充
Original assignee: ACE Co Ltd
Current assignee: ACE Co Ltd
Priority date: 2019-06-26
Filing date: 2020-06-23
Publication date: 2021-02-05
Anticipated expiration: 2040-06-23
Also published as: JP2021003284A; JP6924224B2; CN112334040B; WO2020262334A1

Abstract

Provided is a backpack which can suppress the swinging of a bag body during walking and can suppress the damage of clothes. The backpack disclosed by the application is provided with a bag main body (10), a shoulder strap (20), a waist pad (30) and a fixing part (40). The bag body (10) has a back body part (11), and the bag body (10) accommodates articles. The harness (20) is installed between the upper part and the lower part of the bag body (10). The waist pad (30) is disposed on the back body (11) of the bag body (10) so as to be capable of coming into contact with the waist. The fixing section (40) fixes the waist pad (30) to the back body section (11) so as to be movable in the left-right direction (X1) with respect to the bag body (10).

Description

Shoulder bag

Technical Field

The present invention relates to a backpack, and more particularly to a backpack such as a rucksack or a box-type backpack (backpack) having a back contact portion.

Background

As a backpack having a back contact portion, patent document 1 describes a backpack having a waist pad (lumbar pad). In the backpack described in patent document 1, a waist pad, which is one type of back contact portion, is attached to a lower portion of the pack main body. By providing the backpack with the waist pad, part of the load can be supported by the waist, and the burden on the upper parts of the shoulders and the back can be reduced. In addition, the waist pad is attached to the waist recess, so that the use feeling of the backpack can be improved.

Documents of the prior art

Patent document

Patent document 1: japanese unexamined patent publication No. 3200115.

Disclosure of Invention

Problems to be solved by the invention

However, in the backpack disclosed in patent document 1, if the waist pad is in close contact with the waist when the luggage accommodated in the bag body is heavy, the movement of the waist during walking is directly transmitted to the bag body, and the lateral swinging of the bag body increases, and the load acting on the upper portion of the shoulder and back of the user increases. In contrast, when the waist pad does not follow the movement of the waist, the rubbing of the waist pad with the clothes becomes remarkable, and the damage of the clothes becomes rapid.

The present invention has been made in view of the above problems, and an object thereof is to provide a backpack which can suppress the swing of a bag body during walking, more effectively reduce the burden on the upper parts of the shoulders and the back, and suppress the damage of clothes.

Means for solving the problems

The backpack disclosed by the application is provided with a bag main body (10), a shoulder strap (20), a waist pad (30) and a fixing part (40). The bag body (10) has a back body part (11), and the bag body (10) accommodates articles. The harness (20) is installed between the upper part and the lower part of the bag body (10). The waist pad (30) is disposed on the back body part (11) of the bag body (10) so as to be capable of coming into contact with the waist. The fixing portion (40) fixes the waist pad (30) to the back body portion (11) so as to be movable in the left-right direction (X1) with respect to the bag main body (10).

In the backpack disclosed in the present application, the fixing portion (40) includes a slider (41). The slider (41) is coupled to the waist pad (30), and the slider (41) is coupled to the back body (11) so as to be movable in the left-right direction (X1). One of the waist pad (30) and the slider (41) has a convex portion (31), and the other has a concave portion (41 c). At least a part of the convex portion (31) is spherical. The concave part (41 c) can be connected with the convex part (31) for pivotally supporting the waist pad (30) on the slide block (41).

In the backpack disclosed by the present application, the recess (41 c) has an insertion hole (41 d) having a predetermined shape. The insertion hole (41 d) is loosely inserted with a shaft-like fastening member (43). The convex portion (31) is fastened to the concave portion (41 c) via the fastening member (43) so as to be rotatable with respect to the concave portion (41 c) within a movable range defined by the shape of the insertion hole (41 d).

In the backpack disclosed by the present application, the insertion hole (41 d) is formed by an elongated hole that is elongated in the left-right direction (X1). The elongated hole has extension portions (41 e) extending obliquely upward from the central portion on both sides with respect to the central portion in the longitudinal direction.

In the backpack disclosed by the application, one of the convex part (31) and the concave part (41 c) is provided with a protruding stop part (41 f), and the other is provided with an engaged part (31 b). The engaged portion (31 b) is engaged with the stopper portion (41 f) so as to be able to restrict a rotation angle of the waist pad (30) relative to the slider (41) about a center axis of the convex portion (31).

Effects of the invention

According to the backpack of the present invention, the waist pad for supporting the load at the waist can be moved relative to the bag body, and the load can be dynamically supported by the waist, so that the backpack can suppress the swing of the bag body during walking, reduce the burden on the shoulders and the upper back more effectively, and suppress the damage of clothes.

Drawings

Fig. 1 is a perspective view showing a backpack according to an embodiment of the present invention.

Fig. 2 is an exploded perspective view showing a main part of a backpack according to an embodiment of the present invention.

Fig. 3 is a front view of the backpack shown in state 1.

Fig. 4 is a front view of the backpack showing the 2 nd state.

3 fig. 3 5 3 is 3 a 3 sectional 3 view 3 taken 3 along 3 line 3 a 3- 3 a 3 of 3 fig. 31 3. 3

Fig. 6 is a perspective view showing a waist pad according to an embodiment of the present invention.

Fig. 7 is a perspective view showing a slider according to an embodiment of the present invention.

Fig. 8 is a plan view showing a slider according to an embodiment of the present invention.

Detailed Description

Hereinafter, a backpack according to an embodiment of the present invention will be described in detail based on the drawings. The embodiments described below are specific preferred examples for carrying out the present invention, and therefore, the present invention is not limited to the embodiments unless the meaning of the present invention is specifically described or limited in the following description, although the present invention is technically limited to various embodiments.

< embodiment >

A backpack according to an embodiment of the present invention will be described with reference to fig. 1 to 4. Fig. 1 is a perspective view showing a backpack according to an embodiment. Fig. 2 is an exploded perspective view showing a main part of the backpack according to the embodiment. Fig. 3 is a front view of the backpack shown in state 1. Fig. 4 is a front view of the backpack showing the 2 nd state.

As shown in fig. 1 and 2, the backpack according to the present embodiment is a backpack such as a rucksack or a box-type backpack, and includes a pack body 10, shoulder straps 20, a waist pad 30, a fixing portion 40, and an inner cover 50. The inner cover 50 is disposed inside the pack body 10 and covers the fixing portion 40 and the like. As shown in fig. 2, the inner cover 50 has fitting holes 51 at four corners and two guide pieces 52 parallel to each other. The two guide pieces 52 extend in the left-right direction X1 at a predetermined interval.

In the present embodiment, the back body 11 and the lumbar pad 30 are shown in a state of being exposed in fig. 1 so that the relative positional relationship between the bag main body 10 such as the back body 11 and the lumbar pad 30 can be easily understood, but in actual use, the back body 11 is preferably covered with a flexible member such as cloth or is provided in the bag main body 10, and the lumbar pad 30 is also preferably covered with a cover made of a flexible member such as cloth and indirectly contacts the waist of the user via the member.

The pack body 10 has a back body portion 11, and the pack body 10 accommodates articles. The back body 11 is a portion of the bag body 10 facing the back. In the present embodiment, the back body 11 is a long, flexible plate, but may be a cloth.

As shown in FIG. 1, a back pad 11a is provided on the upper part of the back body 11 to be in contact with the back. As shown in fig. 2, a square pad mounting hole 11b is provided in the lower portion of the back body 11. With respect to the pad mounting hole 11b, the guide piece 52 of the inner cover 50 is inserted from the inside side of the pack body 10 so as to protrude toward the outside side of the pack body 10. Further, around the pad mounting hole 11b, 4 base mounting holes 11c each formed of a circular hole are provided.

The bag body 10 is provided with a luggage outlet that is openable and closable from the upper end to both sides of the bag body 10 by a linear fastener (fastener), for example. The shoulder strap 20 is provided between the upper and lower body portions of the pack body 10.

The lumbar pad 30 is disposed on the back body 11 of the bag body 10 so as to be able to abut against the waist. In the embodiment, as shown in fig. 2, the lumbar pad 30 is a curved plate-like member having a shape that is line-symmetric with respect to a center line S extending in the vertical direction X2. The lumbar pad 30 is curved in a direction in which the gap with the back body 11 increases as it goes from the center line S toward both ends in the left-right direction X1, and the waist can be held from both sides, and movement of the lumbar pad 30 relative to the waist in the left-right direction X1 is suppressed. Therefore, the waist pad 30 can be always fitted to the waist, and the feeling of use of the backpack can be improved.

When the waist pad 30 is covered with the cover, a waist belt for fixing the waist pad 30 to the waist may be provided on the cover of the waist pad 30. Alternatively, the waist pad 30 may be provided with waist belt attachment portions at both side ends thereof, and the waist belt may be directly attached to the waist pad 30. In addition, the waistband may also be riveted to the body or cover of the lumbar pad 30.

As shown in fig. 1, 3, and 4, the fixing portion 40 fixes the lumbar pad 30 to the back portion 11 so as to be movable in the left-right direction X1 with respect to the bag main body 10. In fig. 3, the lumbar pad 30 is moved to the left of the back body portion 11. In fig. 4, the lumbar pad 30 is moved to the right of the back body portion 11. That is, the lumbar pad 30 and the bag main body 10 can move relatively in the left-right direction X1.

As described above with reference to fig. 1 to 4, according to the backpack of the present embodiment, the lumbar pad 30 is movable in the left-right direction X1 with respect to the pack main body 10. Therefore, the relative displacement between the back and the waist during walking can be absorbed, the swing of the bag body 10 can be suppressed, and the damage to the clothes can be suppressed.

That is, in general, the main body of the backpack does not follow the movement of the waist but follows the movement of the back. However, in the backpack including the waist pad, if the waist pad is closely attached to the waist, the lower portion of the bag body swings largely with respect to the upper portion of the bag body in conjunction with the movement of the waist. For example, according to the application of the Chinese medicine in the fields of 'Xiaolingji, Baoyinghaoming and Zhanwan Zhengming', 2015: in the walking simulation using the data provided in the AIST walking database 2015 http:// www.dh.aist.go.jp/database/gain 2015/", the relative displacement between the back (10 th thoracic vertebra) and the waist (5 th lumbar vertebra) during walking is 6 mm at the maximum in the up-down direction X2, 20 mm at the maximum in the left-right direction X1, and the relative displacement in the left-right direction X1 is 3 times or more greater than the relative displacement in the up-down direction X2.

Therefore, by designing the lumbar pad 30 to be movable in the left-right direction X1 with respect to the bag body 10, even if the lumbar pad 30 comes into close contact with the waist and follows the movement of the waist in the left-right direction X1, the relative displacement between the back and the waist during walking can be effectively absorbed, the swing of the bag body 10 can be suppressed, and the load acting on the shoulder and the back can be reduced. Further, since the lumbar pad 30 is movable in the left-right direction X1 with respect to the bag main body 10, a large load in the left-right direction X1 does not act on the lumbar pad 30 from the bag main body 10 during walking, the lumbar pad 30 can easily follow the movement of the waist, the rubbing of the lumbar pad 30 against the clothes can be reduced, and the damage to the clothes can be suppressed. Further, according to the simulation results, the range of movement of the lumbar pad 30 in the left-right direction X1 is preferably about 18 to 25 mm.

Next, another embodiment of the present invention will be described with reference to fig. 1, 2, and 5 to 8. 3 fig. 3 5 3 is 3 a 3 sectional 3 view 3 taken 3 along 3 line 3 a 3- 3 a 3 of 3 fig. 31 3. 3 Fig. 6 is a perspective view showing a waist pad according to the embodiment. Fig. 7 is a perspective view showing a slider according to the embodiment. Fig. 8 is a plan view showing a slider according to the embodiment.

In the backpack of the present embodiment, as shown in fig. 2, the fixing portion 40 includes a slider 41, a base 42, a bolt 43, a bolt cap 44, and a nut 45. The slider 41 is coupled to the lumbar pad 30 by a bolt 43 and a nut 45 serving as a shaft-like fastening member. The slider 41 is connected to the back body 11 by the base 42 so as to be movable in the left-right direction X1 with respect to the bag main body 10.

As shown in fig. 2 and 7, the slider 41 includes a slider main body 41a, a clamping portion 41b, and a recess 41 c. The slider body 41a is a plate-like member that is long in the left-right direction X1. The clamping portion 41b is a plate-like member elongated in the vertical direction X2, and is provided in parallel with the slider main body 41a at a central portion in the longitudinal direction of the slider main body 41a with a predetermined gap from the slider main body 41 a. The recess 41c is formed in the center in the longitudinal direction of the nip portion 41b so as to face the lumbar pad 30.

As shown in fig. 2 and 8, the base 42 is a square thin disk-shaped member, and has a guide hole 42a at the center and coupling legs 42b at the four corners. The slider 41 is attached to the guide hole 42a so as to be movable in the left-right direction X1. The connecting leg 42b is inserted into the base mounting hole 11c of the back body 11 and fitted into the fitting hole 51 of the inner cover 50. The base 42 is fixed to the back body 11 by fitting the coupling leg 42b into the fitting hole 51.

As shown in fig. 5 and 8, the clamping portion 41b of the slider 41 and the slider main body 41a are disposed on the lumbar pad 30 side and the anti-lumbar pad 30 side, respectively, with respect to the base 42 so as to sandwich the base 42 in the guide hole 42 a. The movement of the slider 41 in the left-right direction X1 is guided by the clamping portion 41b and the slider main body 41a sandwiching the base 42 at the guide hole 42 a. The movable range of the slider 41 in the left-right direction X1 is defined by the length of the guide hole 42a in the left-right direction X1.

As shown in fig. 8, the fixing portion 40 is preferably provided with a buffer portion 42 c. The buffer 42c maximally moves the slider 41 in the left-right direction X1, and reduces the impact when the slider collides with the base 42. The buffer portion 42c is formed of an elastic material such as rubber or an elastic body such as a spring. In the illustrated example, the buffer portions 42c are provided at both side end portions of the base 42 so as to be capable of abutting against both side end portions of the slider main body 41a when the slider 41 is moved to the maximum extent in the left-right direction X1. The buffer portions 42c may be provided at both side ends of the slider main body 41a, or may be provided at both side ends of the guide hole 42a, or at portions of the connection portion between the clamping portion 41b of the slider 41 and the slider main body 41a that are in contact with both side ends of the guide hole 42 a. Since the fixing portion 40 has the buffer portion 42c, the slider 41 can be moved to the maximum extent in the left-right direction X1, and the impact sound when colliding with the base 42 can be alleviated.

As shown in fig. 5, the slider main body 41a is positioned between the two guide pieces 52 of the inner cover 50, and the upper and lower sides of the slider main body 41a are in sliding contact with the respective guide pieces 52. The upper and lower sides of the slider body 41a are in sliding contact with the respective guide pieces 52, thereby preventing the slider 41 from rotating about the center axis of the bolt 43. Therefore, the slider 41 is prevented from wobbling when the slider 41 moves in the left-right direction X1, and the slider 41 can be smoothly moved in the left-right direction X1.

As shown in fig. 5 to 7, one of the lumbar pad 30 and the slider 41 has the convex portion 31, and the other has the concave portion 41 c. The concave portion 41c is in a mortar shape. In the embodiment, the lumbar pad 30 has the convex portion 31, and the slider 41 has the concave portion 41 c. The convex portion 31 is projected at the center portion of the surface of the lumbar pad 30 facing the back body portion 11, and at least a part thereof is spherical. In the embodiment, the lumbar pad 30 is a resin molded product, and the convex portions 31 are integrally formed with the lumbar pad 30. The concave portion 41c has a shape corresponding to the convex portion 31, and can be coupled to the convex portion 31 so as to pivotally support the lumbar pad 30 to the slider 41.

As shown in fig. 6, the lumbar pad 30 is formed with a plurality of through-holes 32 for weight reduction and improvement of air permeability. In the embodiment, the through-hole 32 is provided in the entire waist pad 30, and sufficient ventilation from the space between the waist pad 30 and the back body 11 to the waist can be ensured, so that stuffiness can be suppressed, and a good feeling of use of the backpack can be achieved.

As described above with reference to fig. 1, 2, and 5 to 8, according to the backpack of the present embodiment, the waist pad 30 is pivotally supported by the slider 41 by the convex portion 31 and the concave portion 41 c. Therefore, the angle of the lumbar pad 30 with respect to the back body 11 can be changed, and the relative displacement between the back and the waist due to the rotation of the waist and the swinging during walking can be absorbed more effectively, so that the swinging of the bag body 10 can be suppressed more effectively, and the damage to the clothes can be suppressed more effectively.

Next, still another embodiment of the present invention will be described with reference to fig. 5 to 7. In the backpack of the present embodiment, as shown in fig. 5 and 7, the recess 41c has an insertion hole 41d having a predetermined shape. A bolt 43 as a shaft-like fastening member is loosely inserted into the insertion hole 41 d. The convex portion 31 is fastened to the concave portion 41c by a bolt 43 so as to be rotatable with respect to the concave portion 41c in a movable range corresponding to the shape of the insertion hole 41 d. As shown in fig. 6, the projection 31 has a center hole 31a opened at the tip end. As shown in fig. 5, the bolt 43 is inserted into the center hole 31a from the tip end side of the convex portion 31, and is screwed with the nut 45 inside the convex portion 31, thereby fastening the convex portion 31 to the concave portion 41 c.

As shown in fig. 2 and 5, in the embodiment, the bolt 43 is inserted into a cylindrical bolt cap 44 having a large diameter portion 44a and a small diameter portion 44 b. The bolt cap 44 is preferably surface treated to reduce the coefficient of friction. The small diameter portion 44b of the bolt cap 44 is loosely inserted into the insertion hole 41d, and the convex portion 31 is rotatable with respect to the concave portion 41c within a range in which the small diameter portion 44b is movable inside the insertion hole 41 d.

As shown in fig. 5, the large-diameter portion 44a of the bolt cap 44 abuts on the circumferential portion of the insertion hole 41d from the inner side of the bag body 10, and the concave portion 41c and the convex portion 31 are fastened by the bolt 43. That is, the convex portion 31 and the concave portion 41c are fastened to each other by the bolt 43 via the bolt cap 44, and the angle change of the lumbar pad 30 can be smoothed.

As described above with reference to fig. 5 and 8, according to the backpack of the present embodiment, the convex portion 31 is rotatable with respect to the concave portion 41c within the movable range defined by the shape of the insertion hole 41d, and is fastened to the concave portion 41c by the bolt 43. Therefore, by setting the shape of the insertion hole 41d to an appropriate shape, the rotation of the lumbar pad 30 with respect to the slider 41 can be set in an appropriate movable range, and relative displacement between the back and the waist due to the rotation of the waist and the swing during walking can be absorbed more effectively, and the swing of the bag body 10 can be suppressed more effectively, and damage to the clothes can be suppressed more effectively.

As shown in fig. 7, two stopper portions 41f are provided so as to protrude from the concave portion 41c, and as shown in fig. 6, two engaged portions 31b are provided so as to be recessed in the convex portion 31. The stopper portions 41f are loosely fitted to the engaged portions 31b, and the lumbar pad 30 can rotate at a predetermined angle about the center axis of the bolt 43 with respect to the slider 41.

The stopper 41f may be provided in the convex portion 31, and the engaged portion 31b may be provided in the concave portion 41 c. In the embodiment, the convex portion 31 has a cylindrical shape, and the center axis of the bolt 43 substantially coincides with the center axis of the convex portion 31. That is, one of the convex portion 31 and the concave portion 41c has a protruding stopper portion 41f, and the other has an engaged portion 31 b. The engaged portion 31b is engaged with the stopper portion 41f so as to be able to restrict a rotation angle of the lumbar pad 30 relative to the slider 41 about the center axis of the convex portion 31 or about the center axis of the bolt 43 serving as a fastening member.

The walking simulation described above confirmed that the pelvis was inclined to the left and right by a maximum of about 7 degrees during walking. Therefore, the lumbar pad 30 can be rotated by a certain angle about the central axis of the bolt 43 or the convex portion 31, and the relative displacement between the back and the waist due to the swinging of the waist during walking can be absorbed more effectively, the swinging of the bag body 10 can be suppressed more effectively, and the damage to the clothes can be suppressed more effectively.

Next, still another embodiment of the present invention will be described with reference to fig. 7 and 8. In the backpack of the present embodiment, the insertion hole 41d is formed by a long hole that is long in the left-right direction X1, and has extension portions 41e extending obliquely upward from the central portion on both sides with respect to the central portion in the longitudinal direction. That is, in the embodiment, the insertion hole 41d is formed in a heart shape.

As described above with reference to fig. 7 and 8, according to the backpack of the present embodiment, the insertion hole 41d is formed as a long hole that is long in the left-right direction X1, and is formed to have the extension portions 41e extending obliquely upward from the central portion on both sides with respect to the central portion in the longitudinal direction.

Since the insertion hole 41d is a long hole that is long in the left-right direction X1, the movable range of the lumbar pad 30 when it is rotated about the vertical axis X3 shown in fig. 2 can be increased. Further, since the insertion hole 41d has the extension portions 41e on both sides with respect to the center portion in the longitudinal direction, when the lumbar pad 30 is rotated from the neutral position about the vertical axis X3, the lumbar pad 30 can be rotated about the horizontal axis X4 shown in fig. 2 in a direction in which the upper end of the lumbar pad 30 is separated from the back body portion 11.

It was confirmed by the walking simulation described above that the pelvis is tilted forward by about 4 degrees at maximum as the waist rotates during walking. If the pelvis tilts forward as the waist rotates and the lumbar pad 30 is interlocked with the movement of the pelvis, the lumbar pad 30 rotates in a direction in which the upper end is away from the back body 11. Therefore, according to the shape of the insertion hole 41d of the present embodiment, the relative displacement between the back and the waist caused by the rotation of the waist during walking and the forward tilting of the pelvis can be absorbed more effectively, the swing of the bag body 10 can be suppressed more effectively, and the damage to the clothes can be suppressed more effectively.

The embodiments of the present invention have been described above with reference to the drawings (fig. 1 to 8). However, the present invention is not limited to the above-described embodiments, and can be implemented in various forms (for example, the following (1) to (3)) without departing from the scope of the present invention.

(1) As described with reference to fig. 2 and 5, in the above-described embodiments, the convex portion 31 and the concave portion 41c are fastened by the bolt 43 and the nut 45, but for example, a female screw portion may be provided in place of the center hole 31a in the convex portion 31, and the bolt 43 may be screwed into the female screw portion to fasten the convex portion 31 and the concave portion 41 c. In order to prevent the lumbar pad 30 from coming off due to loosening of the bolts 43, it is also preferable to fasten the convex portions 31 and the concave portions 41c by rivets, for example, instead of screwing with bolts. The slider 41 may be provided with a convex portion 31, and the lumbar pad 30 may be provided with a concave portion 41 c.

(2) As described with reference to fig. 2, in each of the above embodiments, the lumbar pad 30 is a plate-shaped member, but the present invention is not limited thereto, and the main body portion of the lumbar pad 30 may be a sheet-shaped (for example, a resin sheet), and the lumbar pad 30 may have a structure in which the convex portion 31 or the concave portion 41c is attached to the resin sheet.

(3) As described with reference to fig. 5 to 7, in the above embodiments, the convex portion 31 is integrally formed with the lumbar pad 30, but the convex portion 31 may be formed separately from the lumbar pad 30 or the slider 41, and for example, the convex portion 31 may be screwed to the lumbar pad 30 or the slider 41.

Description of the reference numerals

X1 left and right direction

10 bag body

11 back of body

20 harness

30 waist pad

31 convex part

40 fixed part

41 slider

41c recess

41d insertion hole

41e extension part

42 base

43 bolt (fastening member).

Claims

1. A backpack, which is characterized in that,

the waist pad is provided with a bag main body (10), a shoulder pad (20), a waist pad (30) and a fixing part (40), wherein the shoulder pad (20) is erected between the upper part and the lower part of the main body of the bag main body (10), the waist pad (30) can be arranged on the back body part (11) of the bag main body (10) in a manner of being in contact with the waist, and the fixing part (40) can be used for fixing the waist pad (30) on the back body part (11) in a manner of moving in the left-right direction (X1) relative to the bag main body (10).

2. The backpack of claim 1,

the fixing part (40) includes a slider (41), the slider (41) is connected to the lumbar pad (30), and the slider (41) is connected to the back body part (11) so as to be movable in the left-right direction (X1); one of the waist pad (30) and the slider (41) has a convex portion (31), and the other has a concave portion (41 c), at least a part of the convex portion (31) has a spherical surface shape, and the concave portion (41 c) is connected to the convex portion (31) so as to pivotally support the waist pad (30) on the slider (41).

3. The backpack of claim 2,

the recess (41 c) has an insertion hole (41 d) of a predetermined shape, and a shaft-shaped fastening member (43) is loosely inserted into the insertion hole (41 d); the convex portion (31) is rotatably fastened to the concave portion (41 c) via the fastening member (43) within a movable range defined by the shape of the insertion hole (41 d) with respect to the concave portion (41 c).

4. The backpack of claim 3,

the insertion hole (41 d) is formed by an elongated hole that is elongated in the left-right direction (X1), and has extension sections (41 e) extending obliquely upward from the central section on both sides with respect to the central section in the longitudinal direction.

5. The backpack according to any of claims 2 to 4,

one of the convex portion (31) and the concave portion (41 c) has a protruding stopper portion (41 f), and the other has an engaged portion (31 b), and the engaged portion (31 b) is engaged with the stopper portion (41 f) so as to be able to restrict a rotation angle of the lumbar pad (30) relative to the slider (41) about a center axis of the convex portion (31).