Large Storage and PocketsOne separate laptop compartment fits 15.6" laptop and 15", 14" and 13" Macbook/notebook/notebook. 3 main pockets can hold up to 35L. USB Port DesignThis USB backpack has a built-in USB charger on the outside and a built-in charging cable on the inside, providing you with a more convenient way to charge your phone on foot. Please note that this backpack is for self-use only, the USB charging port provides a convenient charging channel only. Durable MaterialThe casual backpack is made of high-quality waterproof and durable oxford fabric, smooth zippers and soft padding, ensuring that it is durable for daily use. Serving you as well as a professional office work bag, slim USB charging case, large backpack for college high school students for boys, girls, teens, adults. Breathable and ComfortableErgonomically adjustable padded shoulder straps and fully padded back panel provide pain relief and provide optimal comfort for your shoulders and back. The respirator design lets you enjoy your expenses this hot summer! Size and Capacity17L x 32W x 47H CM Capacity--35 L. Suitable for daily use, very suitable for business trips, students and outdoor activities in daily life.