Laptop Backpack for Long Travel with 30-40L Expandable Large Capacity Water-resistant Black 1800D Oxford Fabric Lamination Fabric

30-40L Expandable Design: Before expansion, it has a capacity of 30L with dimensions of 19.3 x 12.6 x 5.9 (49x32x15cm); after expansion, it increases to 40L with dimensions of 19.3 x 12.6 x 7.9 (49x32x20cm). Two handles are strategically placed on the top and one side, allowing for an effortless switch between backpack and duffel mode. This makes it suitable for both vertical and horizontal carrying, perfect for long journeys.TSA Friendly: The main compartment is designed to be TSA friendly, with the ability to open up to 90°-180° for secure scanning, facilitating a quick and easy passage through airport security checks. The dimensions comply with the maximum size requirements set by the International Air Transport Association (IATA), making it an ideal choice for air travel.Multi-functional Design with Dry-Wet Separation: The front interior features a waterproof compartment for dry-wet separation, perfect for storing toiletries and change of clothes.Multi-functional Electronics Compartment: The interior is designed with two laptop compartments, capable of accommodating up to a 17-inch laptop. The second compartment is suitable for storing electronic devices such as iPads.Ultra-snug and Easy to Carry: The 3D soft-padded back panel and contoured thick shoulder straps provide excellent ergonomic comfort. A movable waist support strap is designed on the back, which can be used to alleviate shoulder pressure when carrying heavy loads, ensuring you remain relaxed and comfortable at all times. Two handles are also provided for easy carrying. Perfect for everyday use. first-class materials and excellent craftsmanship ensure long-lasting durability.