Kelty 3500 and Eagle/TT/LBT/BHI 3-day with frame sheet are the most comfortable bags I've used.
Kifaru and TAG are fairly stiff from the factory and take a while to break in. In your case I don't think that'd be a problem. Load it up and do PT with it on.
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Contras A-06: F**k it, we'll do it live.
修身齊家治國平天下
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