About this item Secure lock design & TSA friendly, MARK RYDEN anti-theft travel backpack is equipped with a smart secure lock to detour theft and well safeguard all your valuables securely. ※The password lock is easily set (with instruction included). The back of this backpack uses breathable cotton, which can support your back and effectively reduce pressure. With a capacity of 17.64L, this backpack is a reasonable way to organize the items you need daily. Perfect for school/work/international travel. This casual backpack has one main pocket and four secondary pockets (as shown in the picture). The main pocket can hold your daily books/clothes, etc. while providing separate compartments for your phone/camera/wallet/sunglasses. Also, your laptop and iPad are provided with separate digital compartments, perfect for the 15.6" laptop and the 10.5" iPad. The main material of this backpack is Oxford cloth, which is waterproof and wear-resistant, and its internal part uses polyester, which is easy to clean and wear-resistant. The zipper is made of the SBS metal zipper. USB Port: The backpack with a USB port outside and offers you a more convenient way to charge your phone while walking.