Description of Osprey Aether 85 Backpack Light on weight and packed with features the Osprey Aether 85 backpack is ideal for the vast majority of backcountry enthusiasts. Its Airscape backpanel provides superior breathability and pack to body comfort while the IsoForm CM hipbelts and IsoForm Harness offer a heat molded fit with gender specific cuts. Sleeping pad straps and a sleeping bag compartment help amplify stowage for added gear necessary to survive during extended excursions. Like a good friend this backpacks got your back. An ideal size for the majority of backpackers, the Osprey Aether 85 backpack will carry what you need - whatever your favorite adventure. Features: AirScape suspension IsoForm Harness IsoForm CM™ hipbelt Airscape backpanel Dual Entry Side Pockets Side Carry Loops Side Order Compatible Sleeping Bag Compartment Sleeping Pad Straps Stretch Front pocket Small: 5000 cu. in. (82L) - 4lbs 10oz (2.15 kg.) Medium: 5200 cu. in. (85L) - 4lbs 12oz (2.21 kg.) Large: 5400 cu. in. (88L) - 4lbs 15oz (2.27 kg.)