The Chestvest is designed for the photographer who wants to pack alot of gear. Extra large pockets allow storage of up to 3 digital camera bodies plus lenses. The two center pockets fit most telephoto lenses like the Nikon 2.8 80-200mm zoom lens and the 300mm F4 as well as the canon 70-200mm 2.8 zoom lens and the 300mm F4 telephoto and even the newer canon 300mm 2.8 lens. Pockets secure camera gear with larges patches of velcro. No zippers are used. Adjustable belts and buckles make for a one size-fits-all design that quickly adjusts to any body size or shape. The adjustable staps keep you cool in hot weather and allow the bag to fit over winter clothing when the temperature drops.