The backpanel is a closed cell foam that is ridged to create air channels--not bad ventilation but not the absolute best either. If you are not willing to go without removed backpanel ventilation, give the Stratos a try.
Word of warning, since the Stratos has a removed backpanel, the frame is super stiff and has been known to bump against the helmet while riding...
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From Osprey's website: 1lb 11oz for the M/L. 710g. Looks like they typed a "2" instead of a "1" on accident...