Simple, lightweight design is made to be attached to your roost deflector with the help of the zip ties and instructions (included). Constructed of 840 and 1680 D nylon ballistic with PU backing for reliability and foam padding for thermal insulation. 51oz (1.5L) bladder and anti-siphon valve keeps water in the hose and just a sip away. Dimensions: • 14"/35.5cm(H) x 7.25"/18.4cm(W) x 1.75"/4.5cm(D) • Vol: 178in (cubed)/ 2917cc • Dry weight: 0.45lbs./204g • Bladder volume: 51oz/1.5L