Peak water bottles offer versatility for trail running hiking and when you have limited space. Ultra-compact filter is tiny but doesn't sacrifice weight or space. Membrane microfilter removes bacteria parasites microplastics sand and more. Made of premium materials that make it tougher and extra-durable. Over-cap protects against leakage. Custom screw top cap. Comes with backwash accessory. Filter lasts up to 2000L (500 gallons). Holds up to 650ml. Dimensions: 4.1" x 10". Meets US EPA & NSF P231 drinking water standards.