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
B65D33/00—Details of, or accessories for, sacks or bags
B65D33/16—End- or aperture-closing arrangements or devices
B65D33/1658—Elements for flattening or folding the mouth portion
B65D33/1666—Slitted tubes with or without a core; U-shaped clips made of one piece
