We designed the RADIX 31 with three things in mind: speed, versatility, and durability. With its lightweight design, it’s a delight for the ardent peak bagger and ambitious day hiker alike.   The RADIX 31 was designed knowing a little less weight can make your mountain mission a whole lot better. Crafted from lightweight Ultra-PE Birdseye and durable, recycled Robic Ripstop fabric, this pack takes the edge off those grueling ascents without sacrificing toughness. An array of adjustable features, like a removable frame, and plenty of external pockets helps you master the game of cubic inches. And the option of women’s or men’s harnessing provides a natural and comfortable fit.  Specifications for Mystery Ranch Radix 31 Backpack - Men's: Manufacturer: Mystery Ranch Gender: Male Weight: 3.1 lb Pack Type: Backpack Capacity: 31 liters Pack Volume: 1755 cubic in Body Material: Technical Ultra-PE Birdseye Hydration Compatible: Yes Fabric/Material: Technical Ultra-PE Birdseye, Recycled 100D Robic Ripstop, YKK zippers Age Group: Adults Style: Casual Pack Loading: Top Last Chance: Yes Features of Mystery Ranch Radix 31 Backpack - Men's Off-center zipper for more convenient accessibility Removable pocketed waistbelts keep your essentials close at hand on the trail Adjustable lightweight harnessing makes your hike that much more comfortable Easily compressible front and side pockets are perfect for holding light layers, water bottles, and/or things you need to get to or stash away quickly Mens and womens harnessing options for a superior ergonomic fit with your body Hydration reservoir compatible Package Contents: Mystery Ranch Radix 31 Backpack - Men's