A belt pack, with style. Made by Osprey and made for mountain bikers, this is one smart little product. With a total capacity of 4 liters. The Bite Valve at the tip of the hose is magnetically attached to the hip belt, staying out of the way when not needed. - Included: a 1.5 liter hydration reservoir with hose and drinking head - Back panel made with AirScape technology: a mesh and grooved foam - Hip belt made of mesh material - Fabric: 210 denier polyester - Attachment point for a LED rear light