Developed to be the most comfortable and lightweight hydration vest available for road and trail with easy-access storage for phones, nutrition, and essentials. Fit & Design: Comfortable, lightweight and breathable airy mesh-lined design 3 moveable/removable front adjustable quick-release lateral stabilizing straps for a custom, bounce-free fit Hydration tube-clip for reservoir or HydraTube(TM) Straws 2 Expandable large multi-use mesh zipper pockets - hold the largest phones and essentials 2 lower pockets for flasks or other storage Includes 1.5L Soft-Tech(TM) Reservoir in lengthy expandable reservoir pocket Upper zip pocket for extras and lower zip pocket Adjustable outer bungee with reflective detailing for carrying a shell S/M (24-40" chest) / L/XL (36-50" chest)