AONIJIE 5L Hydration Backpack: Move freely and carry everything you need for a day on the trail. Head out for an all-day trail run or a technical hike: the 5L backpack efficiently carries your full kit. Lightweight and comfortable, this bag makes sure youre fully prepared for several hours of active adventure. BENEFITS Dynamic Comfort: This pack is designed to let you move faster in more comfort, with a lightweight harness construction, open 3D mesh, and adjustable stretch TwinLink sternum straps.. Quick Access: Front storage lets you quickly access apparel, lateral main storage compartment holds hydration, and stretch pockets keep on-the-go items within reach. Multi-Purpose: A pack that lets you do more than one thing: take along extra gear like flasks, water bladder,appreal, poles, or ice axes Specificaiton: Brand:AONIJIE Item:Running Hydrattion Bakcpack Model:C9102# Weight:approx.167g Capacity:5L(11pcs compartments) Mesh: Polyester Fabric 1:Nylon Fabric 2:85% nylon,15% spandex Fabric 3: 85% nylon,15% spandex Color:Blue,yellow,pink Size: One Size: Recommended Chest Circumference: 72-128cm