Come and see our amazing products.It is made of lightweight, breathable mesh back panel and nylon, and high-quality Cordura fabrics. Compared with an ordinary nylon backpack, it is more durable, quick-drying, lightweight, comfortable, and breathable. Soft and lightweight mesh on the back and shoulder straps maximize breathability. The racing vests pack with adjustable sternum straps can be adjusted to suit most people, enhance fit, and reduce bounce during running. Even wear this hydration backpack for a long time. You will not feel discomfort. Recommended Chest: 28.35"-50.39" (72cm-128cm) We can customize the logo as your request. Pls confirm further with us if any query about packing info, inventory status and time schedule.