Suitable Size for A Waist Bag: This size of fanny pack is 31CM, this is a perfect size for a waist pack , it can accommodate some basic necessity, such as , lipstick , credit card , lip balm,key, cell phone etc when going outside.Waterproof Fanny Packs: This fanny bag is make of durable water-proof polyester material , protect items getting wet from sweat, moist and raindrops, but please dont immerse it into water.Smooth and Sturdy Zipper: The zipper is an essential part of bag, this fanny bag are made of high quality material ,the zipper is sturdy and smooth,dont worry it will get stuck and broken when pulling.you can put the items in different compartment and can organize the items more reasonably, each pocket is roomy , not bulky, it is convenient for you for putting the items inside and taking it out of the pocket.Fanny Pack with Adjustable Strap : With adjustable strap, you can adjust the length of the belt when you want to change into another wearing style, you can tie it on your waist as a waist pack or wear on the chest as a chest pack, it is a stylish fanny pack.