Mystery Ranch Radix 31 Liter Day Pack - Black - The RADIX 31 was designed knowing a little less weight can make your mountain mission a 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. Features 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 Men’s harnessing options for a superior ergonomic fit with your body Hydration reservoir compatible