A tough top-loader that is the smartest and most versatile pack around, the Gregory Z 55 Backpacking Backpack is Great choice for toting your cragging gear or loading up during weight conscious weekend escapes. Incredibly lightweight, yet durable this pack manages up to 3660 cubic inches of storage and up to 47 lbs comfortably. To handle heavier weights in this light configuration a Jetstream Suspension System with auto-fitting harness providessolid Strength, an Aerotech mesh backpanel allows free air flow, and padded scapula and lumbar pads provide exceptional nice. With top and side access, expandable front "Bucket" pocket, secondary front pocket, and dual quick access waistbelt pockets, the Z55 boasts the National Geographic Best of Adventure Gear Award 2007 and Backpacker 5.0 Great Rating.