Osprey Packs Stratos 34 Backpack The Stratos harness consists of mesh covered, die cut foam with sewn-in spacer mesh and an adjustable sternum strap with rescue whistle and buckle Sewn-in spacer mesh hip belt with modified straight Ergo Pull closure and dual zippered fabric hip belt pockets The Stow-on-the-Go trekking pole attachment is designed to conveniently stow your poles when not in use Upper side compression straps on both sides of the pack help to compress and stabilize loads for optimal carry Dual mesh woven side pockets feature Inside Out compression allowing you to tension and secure loads easily even with the side pockets are in use