*The main material is nylon with good air permeability. The fabric is soft. The zipper is rust proof and fastening and smooth.Fits All Waist Size - The waist bag has adjustable elasticated belt fits waists from 60cm-110cm (23.6" - 43.3"), making the bum bags belt ideal for men, women and teenagers.It can hold the Iphone 7/8/X Plus. *The backpack size is about: 16.5in x 6in x 4.3in,dumplings appearance, with two separate compartments with zippers, each compartment design can help you reasonably allocate and store personal items, and simple and intuitive zipper opening design can help you find items quickly and directly. *The internal capacity is large enough to hold things like mobile phone wallet, charging treasure and so on. Comfortable and portable, it will not be distorted and convex because of storage. *The quality of fanny pack is good, the buckle is firm, the shoulder belt is adjustable, compact and reasonable design will not make your body feel restraint and discomfort, the belt is firm, therefore in the process of running, bouncing and so on does not need to worry about the belt body to bring the burden and trouble, it is suitable for all ages family members. *The headphone jack is designed to make it convenient to listen to music and use the function of call during exercise and fitness, so that you can free your hands to enjoy your personal sports time. Many ways to wear this waist pack - You can wear it in front of your waist, back on your hip, slant across your chest or over You shoulder. * Satisfaction Gurantee : 100% satisfaction guarantee warranty and friendly customer service: Don't worry about the service. If you have any problem about the item, Please Do not hesitate to contact us. (Through the order ,you can find out : CONTACT SELLER) We will be there with you!