1. Polyester lined zipper closure2. Dimensions: 12.9 x 7.8 x 2.7 inches (L x W x H). Smaller zippers for cell phones, wallets or outdoor/travel sundries. 2 mesh pockets on each side for water bottles or umbrellas (up to 2.5" diameter). Multifunctional storage area, secondary compartment with functional pocket for mouse, books, documents and more.3. Flexible shoulder straps ranging from 18" to up to 36" with adjustable elastic. Fits your body perfectly. Two ways of carrying: left or right. Carrying a bag for a long time relieves stress. 4. It can be used as a messenger bag/single shoulder bag/Messenger bag/casual backpack/Messenger bag/chest bag/travel bag/work or business bag, suitable for office, school, outdoor, business and other occasions.5. The headphone jack on the front pocket allows you to enjoy music easily. At the same time, the breathable padded shoulder straps and back panel are very comfortable and lightweight, and do not accumulate heat, but release it.6. Made of durable and soft polyester material with smooth sliding zippers and belt clips, allowing you to easily access your items.