Ha, I'm still running a Bozeman-era Astralplane on an XL frame as my winter hiking bag--I've tricked it out with an aftermarket hipbelt and shoulder harness, but I'm guessing it will swallow Bryan's 20x14 Wisner with no problem. (MR is currently making a new version, the T 100, but I'm not sure of the pack bag dimensions.)
Otherwise, for myself my dayhiking loadout is the same as my light backpacking load so I tend toward larger packs, anyway.
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