Thank you for viewing. It has never been used in the field. It was only used to filter tap water a few times and then dried and stored at home, so please purchase only if you understand that it is a used item. There is a scratch on the top surface. This is a water purification bottle that allows you to quickly secure safe water in the outdoors. It can purify water in just 10 seconds and is a compact model with a small drinking spout. You can secure safe water for outdoor activities, overseas travel, and during disasters. It has a check valve (one-way valve) built-in to prevent backflow of purified water in the inner press. It protects the filter from tea and drink ingredients. The one-way valve can be removed. 【Materials】 Outer bottle, inner press, cap: Polypropylene Cartridge: ABS resin Packing, one-way valve: Silicone rubber Outer rubber of inner press: Thermoplastic elastomer #Mountaineering #SourClimbing #StreamClimbing #Creeking