[Material description] Made of durable polyester fabric, high-strength POM slider. [Product performance] Suitable for daily leisure outing. The double-sided pockets are shrinkable and stretchable, and have wrinkle resistance. The entire chest bag material and the stress position are reinforced by a jujube machine, which enhances the durable use of the chest bag. The product adopts ergonomic design. The left and right interchangeable strap design provides optimal comfort for your shoulders, back and chest. The length of the shoulder strap can be adjusted at will, allowing you to easily access any items during use. [Accessory structure] Small size and large capacity, external dimensions (inches): 7.5 "* 15.25" * 3.25 "(width * height * thickness) front slant zipper pocket is easy to carry charging treasure, U disk and other main zipper pockets are convenient to carry mobile , Tablet PC, daily necessities and other internal design user-friendly, built-in special key fasteners, there are two pockets on each side for placing tissues, sunglasses and other items.