External dimensions: 435 x 315 x 60 mm / 17.13 x 12.40 x 2.36 inches, internal dimensions: 425 x 305 x 50 mm / 16.73 x 12.01 x 1.97 inches; suitable for most 17-17.3 inch laptops. 3-in-1 Design: Laptop protector + USB charging port + shoulder bag. External USB charging port with built-in detachable cable allows you to easily charge your electronic devices anywhere, anytime (external battery not included). Detachable Shoulder Strap + Comfortable Handle: Features a detachable and adjustable shoulder strap for convenient use, and can be stored in the pocket when not needed. The soft grip allows you to carry your laptop comfortably for extended periods. 5 Layers of Protection: The waterproof outer layer and cushioning foam layer absorb shocks and provide effective protection against dust, dirt, and accidental scratches. Double zipper provides easy access to your laptop. Large Capacity: In addition to the main pocket, there are additional front and back pockets, providing ample storage space for small items such as cables, chargers, mouse, phone, MP3, and other laptop accessories. Enhanced thickness, stronger capacity.