Wenger Kirchberg 2-Liter Hydration Pack (Red, Grey, Black) Wenger's exclusive DoubleShot bite valve supplies an extremely high flow rate giving the user a healthy dose of H20 Reflective material so you can be seen in the dark External bungee lashing system for additional equipment packing Flow thru mesh shoulder straps keep it light and airy.. WG21210. 16 inches x 7 inches x 3 inches Limited Lifetime Warranty