Osprey Momentum 26 back by Paul Horta-Hopkins · 23/10/2016 A ridged and shaped foam back makes for a comfortable carry. The straps also use foam. Cut outs and mesh on both help with heat control. And there’s a whistle on the chest strap! Share this:FacebookTwitterWhatsAppPinterestTumblrLinkedInPocketEmailRedditLike this:Like Loading...