【Large Capacity Easy To Carry-On】：The backpack with many compartments, organization and expansion.1* main pocket holds your travel items and fits 5-8 pieces of clothing； 1* wet and dry separation bag can hold cosmetics；1* mesh bag in the middle can protect items from being pressed； 2* small pockets can put mobile power and mobile phones； 1* IPAD compartment；1* Laptop Compartment Holds 15.6/16 and Small 17" Computers. 【35-40L EXPANDABLE DESIGN】: Dimensions:( H)17.3*(W)12.8*(T)8.6inches（Thickness can be extended to 12.2in）, Capacity: 35 ~ 40L. Expandable backpack has smooth zippers on side. Once pull on the zipper, bag will offer large capacity up to 40L for you to store more stuffs . 【Classic Backpack Material】: Front PC&ABS hardshell is waterproof and scratch-resistant. Back shock-absorbing pearl cotton helps to relieve the pressure on your shoulders and stay comfortable. The polyester lining is durable and soft, both preventing the fabric from fraying and protecting your computer from scratches. And together they protect your computer from accidents and drops. 【User-Friendly Function】: 1.Waterproof ABS material, internal waterproof pouch to protect your goods from water；2.Ergonomic airflow back design with thick but soft multi-panel ventilated padding for added support and comfort, decreasing the pressure of shoulder and neck; 3.Shoulder straps with adjustable anti-slip chest belt and quick release. 4.External charging interface, convenient to charge the mobile phone by connecting the mobile power supply (Power bank is not included). 【More Convenient Travel】：The two handles set on top and one side, which allow an easy switch between backpack and suitcase. So it can be carried vertically or horizontally. The luggage belt on the back allows being slide over the luggage tube,backpack very easy to carry, it is great for 3-5days daily travel.A great companion for school, commuting, business trip, hiking, travel, camping and other outdoor activities.