1. Anti-splash fabric, real-time anti-splash fabric, anti-tear+anti-fouling fabric, so that you can concentrate more on sports. 2. Large capacity space, large capacity to meet outdoor needs, large capacity space design, easy to hold laptop clothes, water bags, iPad, headphones, folding umbrellas, charging treasures and other outdoor mountaineering needs. 3. Breathable and not sultry, three-dimensional diversion backpack, breathable mesh cloth on the back, no sultry feeling during exercise, always keep comfortable. 4. Thermal insulation, moisture-proof, water splashing-proof and thermal insulation materials. The main bag is made of thermal insulation aluminum foil, and water splashing is avoided. 5. Front earphone hole, earphone hole design, convenient to listen to music anytime and anywhere; Front and rear reflective strips, backpack with multiple reflective strips design, making travel safer at night.