Moose Racing Light Hydration Backpack 3519-0063Slim hydration pack thats perfect for rides where you need your fluids but dont need to carry a lot of cargo Low profile design fits well over or under your riding armor Fully adjustable, padded shoulder straps and chest strap make the pack ergonomically balanced Back padding for added comfort and ventilation channels Smaller external zippered pocket provides extra storage Durable, easy to fill, 2 liter bladder with angle bite valve included