This bag is made from waterproof nylon ripstop fabric and has a YKK Vislon zipper closure to keep your belongings safe and dry as you go on about your day. Its modular design allows for easy customization and repair. Being one size bigger than the FOLD POUCH - SMALL, it is designed to easily fit your phone, wallet, or even a small jumper and a water bottle. Use it to assemble the FOLD SLING LIGHT - MEDIUM.