UKEIN Travel Backpack for Adults with USB Charging Port 36L Expandable Carry on Backpack Water-resistant Business Travel Backpack for Men

【Expandable Design】Transform this travel backpack from a personal item size to a carry-on with ease, increasing capacity from 28L to 36L. Perfect for flights, fits under the seat for hassle-free travel. 【Spacious and Organized】Within this travel backpack for adults, discover an ample main compartment for storage, front pockets for small items, a dedicated 15.6-inch laptop compartment, and a specialized side pocket for a 1000ml water bottle. 【Waterproof and Anti-theft】Crafted from high-density waterproof material, this travel backpack ensures your belongings remain dry. Features dry/wet separation bags, an anti-theft pocket, built-in USB port, and charging cable. 【Practical and Comfortable Design】Equipped with heavy-duty zippers and reinforced stitches, this carry on backpack for men guarantees durability. Cushioned back and shoulder straps with breathable mesh, adjustable chest straps, and luggage strap for trolley attachment. 【Versatile and Reliable】This carry on backpack for airplanes seamlessly transitions between backpack and suitcase, suitable for travel, casual use, weekender trips, or hiking adventures. Multipurpose design for various needs.