Material and size: The laptop backpack is made of high-quality polyester and offers a high and durable performance with minimal weight. For extra durability, the polyester material is waterproof, tear-resistant and scratch-resistant. Size: 30 x 18 x 42 cm (11.8 x 7 x 16.5 inches). Capacity: 19 litres. USB port design: With an integrated USB charger on the outside and an integrated charging cable on the inside, this USB backpack offers a more convenient way to charge your while on the go. Please note that this backpack is not self-powering; the USB charging port just provides easy access for charging. Backpack with unique design: Laptop slot: 41.5 x 28.5 cm. A separate laptop compartment holds a 15.6 inch laptop. A spacious compartment for everyday needs and technology/electronics accessories. A front compartment with lots of pockets, makes your items organised and easier to find. Ergonomic design: Two curve padded shoulder straps with an extra thick and ultra-breathable design make the backpack easy to carry and provide reinforcement. Wide range of uses and casual: The daypack is suitable for many occasions. Unisex for men and women. You can use it for school or college, and when hiking, shopping, cycling, travelling, dating, etc.