The RIBZ front pack is made of 210d water resistant ripstop nylon and weighs approx. 9 oz. All components are water resistant with proven durability in the most extreme of conditions. With an average storage capacity between 600 and 800 cubic inches, you can comfortably carry up to 10 pounds in a front pack! The use of a front pack repositions a portion of your weight forward which reduces your overall shoulder stress and increases comfort, mobility and balance. A front pack also creates the illusion of carrying a lighter load. Though the RIBZ front pack was designed with ultralight backpacking adventures, it will prove beneficial.in any outdoor activity where easy access of equipment is critical. RIBZ front packs work beautifully as a stand-alone piece (like a vest) but is primarily designed to work with your existing backpack for increased functionality.