AFTER SALES SERVICE GUARANTEE: We solemnly promise that within one year of purchasing and receiving this product, if any quality defects occur during normal use (not due to improper use or human damage), you only need to take a photo of the defective product and contact us. We will reply with a solution to the problem within 24 hours, or send you a new identical product for free to replace the defective product(Note: Products purchased and used for more than one year do not enjoy this right) | DIMENSIONS & DURABLE MATERIAL: Size of extra large laptop backpack: 12(L)x8.5(D)x17(H) inches. Made of sturdy lightweight fabric, nylon lining, and sturdy hardware. Comfortable, spacious, and breathable back mesh and shoulder straps, as well as abundant sponge pads, help relieve shoulder pressure. Women's premium business travel bag, men's computer backpack | FLIGHT APPROVED: The 180 degree zipper closure of the travel backpack can help you quickly pass through security checks. Suitable for placing overhead luggage racks or under seats. This portable backpack makes your journey more enjoyable and convenient | LARGE CAPACITY: This travel backpack has many different pockets, including a main pocket, wet clothes pocket, stationery storage pocket, separate computer storage pocket, bottle pocket, umbrella pocket, anti-theft pocket, and zipper pocket, making your items organized and easier to find. Can accommodate many things, such as university supplies, travel accessories, clothes, laptops, 13 inch MacBook, 14, 15, 15.6, 17 inch laptops, wallets, etc., university backpacks | MULTIPURPOSE: A large backpack is very suitable for indoor and outdoor activities. As a long-lasting use backpack business work bag, travel bag, laptop bag, or spacious university backpack, you can use it anywhere for international travel, daily use, camping, hiking, and overnight travel. This is the best gift for family and friends(This item is not intended for use by people 12 years old and under)