Expandable Large-Capacity Oxford Backpack

44-52L EXPANDABLE DESIGN Before extended is 44L, the dimensions are 21.2x7.8x16inch; after extended is 52L, dimensions are 25.2x7.8x16inch. You can expand the zipper and buckles according to your requirement.it is great for 3-7days daily travel. LARGE CAPACITY EASY TO CARRY-ON The backpack with many compartments, organization and expansion.The main pocket can hold your travel goods,fit 5-8pcs clothes. It is cool that there is a wet pouch to liquids.Front compartment can also hold magazines,Ipad and power bank which can charge your phone. Backpack Back with padded batter can protect your laptop. WATERPROOF & ANTI-THEFT DESIGN 1. Backpack back zipper pocket protects your precious articles, such as phone, passport, wallet from potential theft when traveling or lining up;  2 Waterproof PVC material, internal waterproof pouch to protect your goods from water. 3.Ergonomic airflow back design with thick but soft multi-panel ventilated padding for added support and comfort, decreasing t