Expandable Travel Laptop Backpack

Specification This college bookbag can be expanded to 36.8L. Travel laptop backpack owns 17+ independent pockets, which can make your items well-organized and easier to find. Durable and waterproof materials can provide a protection for your items in rainy day and long-lasting usage for everyday. 15.6'': College Bookbag Dimensions: ‎18 x 12.5 x 8 inches; After expandable: 18 x 12.5 x 10 inches; Item Weight: 2.29 pounds; Normal size Capacity: 29.5 L; Expandable size: 36.8 L; 17'': Dimensions: 13.5 x 19.5 x 8 inches; After expandable: 13.5 x 19.5 x 10 inches; Item Weight: 2.55 pounds; Normal size Capacity: 34.5 L; Expandable size: 43 L; Features Ergonomic back support  17+ independent pockets Water-resistant polyester material Built-in USB port Hidden anti-theft pocket  Ideal travel/work gift