Feature: 1. Rational Layout: It features a dedicated shoe bin designed to accommodate various shoe sizes, protecting their shape while saving space. Its large main compartment and multiple pockets allow for efficient organization of your belongings. The upgraded wet and dry separation function enables you to store damp towels or umbrellas, providing a scientific storage solution. The additional angular space on the compressed bag is ideal for stashing small items. 2. Comfortable Carrying: Designed for comfort, the backpack includes a hand held mode with a hook and loop grip that conforms to your hand, offering a pleasant holding experience. The double shoulder mode features broadened and thickened straps for added comfort. You can switch easily between shoulder and sling shoulder carry styles with detachable straps. 3. 180° Opening and Watertight Materials: It boasts a one piece case structure with a main compartment that opens to 180°, facilitating easy access to larger items. With watertight materials, you no longer have to fear that rain will damage your work documents or laptop, preventing any awkward situations caused by wetness. 4. Luggage Strap: The backpack includes a luggage strap that securely attaches to your wheeled suitcase, allowing you to liberate your hands and alleviate physical strain while traveling. This practical feature lets you delegate the weight to your rolling luggage, enhancing your travel experience and making it considerably more convenient. 5. Zipper and Hanging Hook: It is equipped with a double direction zipper, offering smooth opening for easy access to your items. The tightly interlocked teeth of the zipper design ensure minimal effort during use. Additionally, the fastener prevents the bag from deformation even when the bag has loaded too much. The convenient hanging hook allows you to effortlessly store items like glasses or other accessories. 6. More Details: The nylon hand strap allows for ease of lifting without discomfort, while adjustable strap buckles ensure a customizable fit. The reinforced stitching at connection points and triangular stress areas provides durability. Specification: Item Type: Backpack Material: Oxford Cloth, Polyester Weight: Approx. 1493g / 52.7oz Capacity: 36-55L Function: Breathable Accommodate Computer Size: 17.3 Inch Color: Black Backpack Size: Approx. 32x46x16cm / 12.6x18.1x6.3in (Extended Thickness: 22cm / 8.7in) Hold: Phone, Umbrella, Earphone, Wallet, Computer, Clothes and Other Objects Pump (Built in Battery): Li Battery 1500MAH. Package List: 1 x Backpack1 x Shoulder Sling Strap1 x Pump1 x USB Cable2 x Accessory1 x Instruction Manual