One-size-fits-all form-fitting pack for securely carrying essentials on shorter to moderate length runs. Sensifit construction wraps the pack around the body without binding or abrasion. PVC free bladder with Plug n' Play hose connector for quick hydration. Ultra Comfortable. Ultra Lightweight. 2 Front Pockets. 2 Side Pockets. 2 Rear Pockets. Hydration Bladder Included.