So are you like me and need a storage case for my face mask or extra face mask? This small case will allow you to fold a mask inside and can be hooked on a backpack, slipped in a purse or backpack and even added to a key ring. This is perfect for a "just in case" something happens to your child's mask at school. Avoid the dreaded school call asking you to come get your child because he/she lost their mask or dropped in the dreaded toilet! Only 3.25 inches and won't take up much room!! Plus keeps it clean!