Expansion design This Travel backpack is airline approved as a carryon. It features an expandable design from 28L to 38L for large capacity. With two handles on the and sides, it can be carried vertically or horizontally and used as a handbag or backpack. Spacious interior The laptop backpack has a large capacity with a main compartment, a front zip pouch, a shoes pouch, and wet and dry separation compartments. It can hold a 15.6 inch laptop, daily necessities, electronic devices, and toiletries, keeping items organized and easy to find. Multipurpose A unisex laptop backpack for women and men. It features a breathable mesh back for heat dissipation and widened shoulder straps to reduce pressure and weight. Widely used for business trips, daily use, travel, college, and work; suitable for college students, school students, and middle school students. Water resistant material Made of water resistant polyester material with spill and scratch resistance. Smooth and secure zipper for easy access. Suitable for daily use and business trips. Use scenarios Business travel: carry a laptop, documents, and essential accessories with organized compartments for quick access. Daily commute or school: fits a 15.6 inch laptop and daily essentials, with comfortable carry. Weekend trips: expand to 38L to pack extra clothes and shoes for short trips.