With the lightweight, chafe-free and breathable materials, this bounce free vest can store all of your running essentials with different storage pockets. Stay hydrated with the 2L bladder and front storage pockets that can fit more bottles! Fit & Design: Adaptive-Fit(TM) adjustable sizing system for tailored fit Breathable, chafe-free materials for maximum comfort Equipped with a 2L bladder with quick release valve Transparent zippered pocket for quick view of essentials Back kangaroo pocket for stashing layers, and more Large main back storage compartment Front pockets fit bottles and flasks up to 22oz Reflective hits for 360-degree visibility Additional Details: Storage Capacity: 427 cu in/7 Liters Weight W/O Bladder: 8.3 oz/235 g Weight With Bladder: 12.2 oz/347 g