Large Capacity Messenger Bag]-- Scientific and reasonable capacity. The size of this shoulder bag is about: 28*22*7.5 cm. and the capacity is about 5L.Consist of 1*Front Compartment+1*Main Compartment+1*Back Compartment. The Front Compartment is easy to open/close, so you can put it into items that need to be used frequently. The main Compartment is a large capacity for books, tablets, water bottles, and lunch boxes. The back compartment is hidden for values. Multiple pockets and rooms can make your things more organized.