●Made of high quality nylon and sturdy buckle, this hydration backpack not only reduces shoulder strain but also ensures optimal stability ●Soft, lightweight mesh on the back and shoulder straps for maximum comfort ●Specially designed for road biking, running and hiking, this hydration pack is the ideal outdoor companion ●Fully adjustable shoulder straps and chest straps ensure the pack is a perfect fit and prevents bouncing during running ●Built-in hydration bladder compartment keeps the bladder stable and prevents wobbling during activity