1. The fabric is abrasion-resistant and scratch-resistant, and the high-density nylon fabric is scratch-resistant and abrasion-resistant, and can cope with various environments. 2. Large-capacity practical storage, including large-capacity loading space to meet the needs of travel. 3. Conveniently store the water bag, release the two-hand quick outdoor drinking system and replenish water at any time (the water bag needs to be purchased separately, which is not included in the product). 4. The helmet fixing net cover and the front breathable net cover design are convenient for fixing the helmet and practical and portable. 5. Breathable mesh back, breathable mesh back, no sultry feeling during exercise, dry and comfortable.