Backpacks features: Multi-functional water resistant usb notebook backpack(Purple) Color: we send based on the color or size of the main image of the product page. Quantity：we send based on quantity on title, if there is no quantity in the title, we send based on description. Colour:Purple Bag size: large Capacity: 36-55L Package internal structure: ID bag, mobile phone bag, laminated zipper bag, zipper pocket, computer pocket, camera pocket Opening method: zipper buckle Applicable gender: neutral / male and female Material: Canvas Whether with a lock: Yes With or without rain cover: Yes Function: waterproof, breathable, wear-resistant, anti-theft, lightening, shockproof Processing methods: soft surface Hardness: hard pattern: plain Style: Fashion Sports Lining texture: polyester Accessories type: anti-theft device Strap root number: double root Popular elements: car suture Lifting parts: hard handle Outer bag type: digging bag Bag shapes: square vertical section With or without tie rod: Yes Carrying system: curved shoulder strap Scene: Travel Size: 30*13*42cm Package includes: 1 x bag Note: it has a USB charging interface, but it doesn't include any USB cable or power bank.