"Avi",

I have a WM Megalite. It's plenty big for me and I have a 42" chest. Plus, though it's rated to 30 F I've been fine in it at 22 F with only light long johns & stocking cap.
The Megalite is made for people who want a bit more shoulder room.

Eric
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"There are no comfortable backpacks. Some are just less uncomfortable than others."