God, neither. The IBLE you show really is a horrible pack. It looks like the "assault pack" portion of the full pack system. Almost everyone I knew who was in a unit that gave them a choice on packs used some sort of mountain ruck on an alice frame. If I were making a bug out bag I'd probably just hit a military surplus store and buy a cheap large alice pack, frame, an isomatte. Rip up the isomatte and riggers tape it around the frame tubes and where the pack needs more support. Then just line it with a thick garbage bag and you've got a waterproof and buoyant pack that military operators have been using for the past 50 years. In a town outside of a military base that has a lot of surplus stores you can buy everything for under $50 probably.
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