"Haul heavy gear through challenging environments with the durable Osprey Kestrel 48 Backpack. An Atilon framesheet spreads weight across the entire back panel and to the peripheral frame, and the 3.5mm LightWire peripheral frame transfers the load from the harness to the hipbelt, so you can carry heavy loads comfortably. Plus, an AirScape back panel with mesh-covered, ridged foam maximizes ventilation while keeping the pack close to your body. An external reservoir sleeve, dual tuckaway ice-tool attachments, a zippered sleeping-bag compartment, removable sleeping-pad straps, and trekking-pole attachments ensures there's a place for every piece of important equipment you need at the campsite or on the trail. In addition, a fixed top lid with an external zippered pocket and zippered under-lid pocket, front shove-it pocket, dual stretch mesh side pockets, zippered hipbelt pockets, zippered side pocket, and front-panel daisy chains offer even more storage options for gear. An integrated raincover protects the pack and contents from inclement weather. Dual upper StraightJacket side compression straps and dual lower side compression straps. Main body is made of 210-denier and 630-denier nylon dobby. Bottom is made of 500-denier nylon packcloth. Main: 210-denier and 630-denier nylon dobby Bottom: 500-denier nylon packcloth Atilon framesheet spreads weight across the back panel and to the peripheral frame 3.5mm LightWire peripheral frame transfers loads from the harness to the hipbelt AirScape back panel with mesh-covered, ridged foam maximizes ventilation External reservoir sleeve Dual tuckaway ice-tool attachments Zippered sleeping-bag compartment Removable sleeping-pad straps Trekking-pole attachments Fixed top lid with zippered external pocket and zippered under-lid pocket Front shove-it pocket Dual stretch mesh side pockets Zippered hipbelt pocket Zippered side pocket Front-panel daisy chains Integrated raincover Dual upper StraightJacket side compression straps Dual lower side compression strapsSpecs: Small/Medium: 27.6""H x 13.4""W x 12.6""D Capacity: 46L Weight: 3.44 lbs. Medium/Large: 29.5""H x 13.4""W x 12.6""D Capacity: 48L Weight: 3.59 lbs."