1. Rainproof and waterproof function
2. There is a compartment to store items to avoid scratching
3. The bandage shall be pasted firmly to avoid shaking
4. Avoid the bag touching the leg during riding
5. The inner wall is thickened and fluffy, so as to avoid scratches of sharp and hard objects
6. Crash proof and fall proof to avoid damage to fragile items such as mobile phones
