a large bag, usually having two straps and a supporting frame, carried on the back and often used by climbers, campers, etc. US and Canadian name: backpack
[C19: from German, literally: back sack]
Happy to help :) Please don't edit your posts in the future, this "." creates a feeling of chaos, like what are we even talking about? You proposed something that made sense, we accepted it, let your proposition stay.