【Under-Seat Bag】This travel backpack measures 40x30x15 cm and is designed to fit perfectly under your seat, maximizing your carry-on space and ensuring your safety on flights with airlines such as British Airways, KLM Royal Dutch Airlines, Air France, and Witz Airlines. You can quickly and easily access your essentials during your journey. 【Waterproof Travel Backpack】This travel backpack is made of high-quality nylon, making it waterproof and tear-resistant. The ultra-light material reduces the burden on your shoulders and back, meets the needs of outdoor travel, and is durable and fatigue-free. The waterproof and leak-proof nylon material effectively protects your belongings. This backpack is suitable for both men and women and is ideal for weekend trips or business travel. 【Multi-Pocket Backpack】This 40x30x15 cm travel backpack features a spacious main compartment and cleverly designed pockets, providing ample storage space for all your carry-on needs. This backpack has a total of 7 pockets, including a front zipper pocket, a main pocket, a compartment that can hold a 14-inch laptop, a back security pocket, and two side pockets. Multiple pockets make it easy to organize your items during the flight and keep them within reach. 【Creative Ergonomic Design】This travel backpack features breathable mesh shoulder straps and thick foam padding to effectively reduce shoulder pressure. The adjustable shoulder straps allow the backpack to fit your body perfectly and stabilize your center of gravity. Its ultra-light weight ensures that you won't feel tired even after carrying it for extended periods. 【Best Travel Companion】High-quality metal zippers run smoothly and do not get stuck easily. Over 28 reinforced stitches ensure durability. You can use it as a hiking backpack, camping backpack, tactical backpack, travel backpack, survival backpack, and more. This compact yet spacious 40x30x15cm travel backpack combines stylish design with practical functionality, making it the perfect travel companion and an ideal gift for friends and family.