So, first off, the backpack is SICK, super quality, functional, and avalung is definitely key. But I am 6'2 and 210 lbs (not fat either) and this thing is TIIIIIIINY! I just picked up a 32L, size L/XL and it fits perfectly! So for all you tall and big dudes out there, dont get the S/M 22L unless you wanna feel like there is a tiny midget strangling you on your back.
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