Osprey Aether 70 Backpack (Dusk Blue, Small) Unique feature: 2/3 length aluminum stay IsoForm Harness: Spacer mesh surface with no sewn seams, hook and loop adjustable yoke allows 4"/10cm of fine torso adjustment Lightweight Alloy Peripheral Frame Suspension: Ribbed foam backpanel with grip mesh and recycled HDPE framesheet with weight reducing cutouts IsoForm CM Hipbelt: Heat moldable foam (using Osprey CM in-store hipbelt ovens) with ErgoPull hipbelt closure Volume: 4000cu in/67L Weight: 4lbs 12oz/2.15kg