It comes back to the purpose of a Bug-Out-Bag. If you have a place to Bug-Out to, then the bag only needs to carry enough to get you there. If OTOH its purpose is to sustain you while you are wondering around going nowhere, then it doesn't matter much how slow you move, carry a whole lot of stuff. But if you have nowhere to go, why Bug-Out?
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Better is the Enemy of Good Enough.
Okay, what’s your point??