PITAT Running/Marathon Waterproof Waist Pouch with Water Bottle Pocket. I used it once, and then stored it at home. The zipper has rusted during storage, but it does not affect opening and closing (see photo 5). [Product Information] A new sensation running bottle pouch that integrates with your body. Experience more comfortable running with PITAT PRO. Durable Waist Belt The movable belt made of nylon material does not stretch out due to frequent use like rubber. ◎ Waterproof Made of nylon material, it is resistant to dirt and has a waterproof effect. (※There is a hole for earphones, so it is not completely waterproof) 360° Insulation Sheet Excellent for cooling and heat retention. ◎ Excellent Storage Capacity The large main pocket has a dedicated smartphone storage pocket. The sub-pocket has a ZIP to reduce the risk of losing valuables. ◎ Ultra-Lightweight Design The lightweight design, with a total weight of approximately 168 grams, reduces the burden on your waist. ◎ Water Bottle Pocket Can store up to 800ml water bottles. With a belt, it can be fixed tightly, reducing bottle shaking. ◎ Durable Fabric Made of nylon fabric that is resistant to scratches and dirt, and can be washed in a washing machine with a net after use! ※ Dimensions of the water bottle storage part: Approximately 7.5 cm in diameter (bottle opening), approximately 12 cm deep (1 cm increase) ■ Waist Size: F Approximately 65-105 cm ■ Material: Nylon ■ Country of Origin: China We will take waterproof measures and ship it immediately.