Description: Feature: 1. Cool LED Display: Equipped with magical colorful LEDs, creating a dazzling visual effect. Besides, it features sound activation. The lights can flicker in response to surrounding noise or music vibrations. 2. High - Capacity Battery: Powered by a battery (3.7V, 500mAh). A single charge offers long - lasting power, ensuring the backpack remains illuminated during extended use. 3. Lightweight Portable: Crafted from ultra - lightweight nylon, weighing approximately 230g. It won't add excess burden during outdoor activities. 4. Spacious 15L Capacity: Roomy enough to carry all your essentials while on the go. 5. Convenient Operation: Short press to toggle display animation; long press to turn the screen on/off. Also, it's USB rechargeable. You can charge it anytime and even use it while charging. It can be charged via computer, car charger, USB charging, or power bank. Specification: Material:Nylon Capacity:15L Battery: (3.7V, 500mAh) Charging Method:USB rechargeable Size:402515cm / 15.79.85.9in Weight:Approx.230g / 8.1oz Package List: 1 x Backpack 1 x Instruction Manual