Osprey Aether 60 BackPack Unique feature: HDPE integral 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: 3700cu in/60L Weight: 4lbs 15oz/2.23kg