I saw a 7016 Long Range Bugout bag on a UK site and it converts to a backpack or use it like luggage, but I don't know if it's any good. If you were doing any long range hiking it would probably be uncomfortable, but it had 6300 cu. in of space. Anybody had any luck with these packs?
Bug Out Bag
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Failure is not an option!
USMC Jungle Environmental Survival Training PI 1985