Top-loading main compartment with padded 3D suspension contouring promotes ventilation and upper body mobility Upper and lower side compression straps reduce bulk and stabilize the load for optimal weight distribution and carrying comfort LightWire™ peripheral frame connects the upper load lifters and the central core of the pack to the hipbelt to spread the load Anti-Gravity ventilated mesh back panel contours automatically to the body, distributing weight and providing an outstanding fit Adjustable harness and Fit-on-the-Fly™ hipbelt allow you to fine-tune the fit for maximum comfort Removable floating top lid contains 2 zippered pockets with web attachment points Integrated FlapJacket™ protects contents from foul weather and rain during lidless use Zippered hipbelt pockets and dual-access stretch mesh side pockets with InsideOut™ compression straps Pack exterior also features front stretch mesh pocket, 2 ice tool loops and Stow-on-the-Go™ trekking pole attachment Pack bottom contains zippered sleeping bag compartment with a removable divider Removable sleeping pad straps; sternum strap has an integrated safety whistle Hydration sleeve accommodates reservoirs up to 3L (sold separately) Imported. Important WARNING for California residents View all Osprey Backpacking Packs Technical Specs Best Use Backpacking Frame Type Internal Frame Gear Capacity (L) S: 47 liters M: 50 liters L: 53 liters Adjustable Torso Length Yes Fits Torso Length (in.) S: 16-19 inches M: 18-21 inches L: 20-23 inches Fits Waist/Hips S: 24-45 inches M: 27-48 inches L: 29-55 inches Material(s) 100-denier x 630-denier nylon dobby/210-denier high-tenacity nylon/420HD nylon Frame Material LightWire Number of Stays 1 peripheral hoop Reservoir Compatible Yes Suspended Mesh Back Panel Yes Pack Access Top/bottom Number of Exterior Pockets 9 + main compartment Sleeping Bag Compartment Yes Hipbelt Pockets Yes Dimensions 33 x 15 x 15 inches