B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
B65D21/00—Nestable, stackable or joinable containers; Containers of variable capacity
B65D21/02—Containers specially shaped, or provided with fittings or attachments, to facilitate nesting, stacking, or joining together
B65D21/0234—Nestable or stackable container parts forming a receptacle when one part is inverted upon the other