NEVLIE 36L 55L Expandable 18 Inch Laptop backpack, Large Capacity, Waterproof, Carry On Backpack for Men Women, with USB Port, Luggage Strap and Chest Buckle, Travel School Collage Black

EXPANDABLE 55L CAPACITY: Easily expands from a 36L daily commuter bag (14cm depth) to a 55L travel backpack (24cm depth) by unzipping the side expansion zipper. The dimensions are 46cm x 30cm, making it perfect for daily life or extended travel. TRAVEL-FRIENDLY FEATURES: Equipped with an external USB charging port to keep your devices powered while walking (power bank not included). A sturdy luggage strap on the back allows the backpack to slide over suitcase handles for hands-free transport. WATERPROOF & DURABLE: Made from high-quality waterproof material to protect your electronics and clothes from rain and spills. Built with durable zippers, strong buckles, and cushioned handles on both the top and side for versatile carrying options. COMFORTABLE: Designed with a breathable mesh back panel to ensure air circulation and reduce sweating. The adjustable shoulder straps feature a weight-balance chest buckle (sternum strap) to distribute load evenly and relieve shoulder pressure.