Drift Hydration Pack Backpack with 2 Liter Water Bladder Fits Men & Women & Children for Running Marathon Racing Hiking Backpacking Hunting Camping Cycling Walking Climbing Kayaking Outdoor Survival;

-Backpack with 2 Liter Hydration Bladder -Lightweight and Durable Separate Storage Compartments -Movable Toggles to Hold Racing Number -Emergency Whistle -Multiple Separate Pockets -Gel Pack Holders -Large Opening for Filling and Cleaning Bladder -Detachable Water Tube for easy cleaning -Reflectors for Visibility at Night on Front and Back -Reinforced Zipper Pulls and Hanging Strap -Padded back and Channeling for Increased Airflow -Phone Pocket with Ear Phone Cord Hole Tested by actual Marathon Runners-Will Fit Upper Chest size up to 47" and waist to 46".