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if you by any chance are a bear, I'd recomend the powerframe 130l+ backpack!
it is designed to carry everything you might ever need, and then whatever cool shit you pick up along the way.
the pack itself is 5kgs, its about 180 high, and the two side pouches comes off and can be used as lighter day packs.
also, the frame comes off, and has attachments in case you need to carry heavy boxes with it.