The Essential Bottle Pack is a road runners dream hydration waist pack. This water belt comes standard with a 550 mL UltraFlask in the mesh pocket. It can hold your phone (up to an iPhone 7+) and comes with a bungee cord for a jacket or shirt. The Essential Bottle Pack is made with a conical shape that allows for a comfortable fit and a bounce free ride. Adjustable strap allows for one size to fit most. Features: - Lightweight and simple waist belt for daily training - Large pocket to hold UltraFlask 550 - Storage compartment to hold essentials (large enough to hold iPhone 7+) - Can hold any half liter bottle for hydration needs - Size: 26"-43" - Hydration: 1 x 550 ml UltraFlask - Capacity: 128 c.i. (2 L) - Dimensions: 14.5" x 2.5" x 10" - Weight: 5.6 oz (159 g)