This large travel backpack with expandable feature fits 17.3" laptop. It fits overhead bin or under the seat for traveling. Front compartment is for little gear such as phone, earphone and power bank. The padded straps include a sternum strap that can be adjusted upward or downward, set to go across your chest, relieving the weight from your shoulder. The shoes compartment can hold a pair of slippers or low-top sneakers, allowing you to switch in different states of travel, business trips and outdoor sports. The wet pocket is made of thickness waterproof EVA, which can be used with to store wet items. Comfortable airflow back design, thick and soft multi-panel ventilated padding provides back support. Breathable, adjustable shoulder straps and a chest buckle to relieve shoulder pressure. This backpack can be slipped on the trolley of the luggage to make traveling easier. Hidden anti-theft zipper pocket on the back to prevent your valuables from being stolen.