This hiking backpack closes with, among other things, a buckle and zipper. One of the materials used to make this bag is cotton and it has a volume of 52 litres.
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Fjällräven Keb 52 Olive/Deep Forest Outdoor Backpack
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Fjallraven Unisex's Keb 52 Sports Backpack, Olive-Deep Forest, Taglia Unica, One Size