The CamelBak Ultra™ Belt is the Ultra and trail runner's best friend. Complete with a collapsible Quick Stow™ Flask and attached pocket for a phone and other small necessities, runners will have just what they need at their fingertips. 3D Vent mesh throughout this belt provides optimal breathability and comfort. 1L Total capacity, collapsible Quick Stow™ Flask holds 17 oz. Attached pouch designed to carry nutrition items and other necessities. Adjustable waist buckle for easy, personalized fit. Features reflective accents for greater visibility in low light.