Cilocala Keyboard Backpack Middle (Sailor)The familiar symbols on the keyboard are mysterious! A backpack in medium size that looks like an elegant monogram pattern. The back pocket can hold a 13. 3 inch Laptop (equivalent to MacBook Air, A4 size). The side pockets are designed to hold a 500ml plastic bottle, a personal bottle (water bottle), or a folding umbrella. In addition to everyday use, it is also useful for sports such as yoga and the beach, and outdoor scenes such as camping,