Guinness World Records - The largest backpack or rucksack is 4.315 m (14.15 ft 1.88 in) in height, 3.21 m (10 ft 6.38 in) in width, 1.47 m (4.8 ft 9.87 in)
World's largest backpack | Big backpacks, Large backpack, Herschel heritage backpack
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Worlds largest backpack? | Pål-Kristian Hamre | Flickr