Check the listing for details. Mini Purification Water Filter Purifier Drinking Water Filtering Straw Outdoor. Color: white, green, Condition: New. Listed at 11.02 USD. color: white, green size: 12*3cm (4.72*1.2in) name: outdoor mini filter straw packaging: 1pc water purifier style:UF filter material: non-woven fabric+paper box storage: dry & low temperature storage, light shielded key features: 1. filter more: filters up to 4000 liters of natural fresh water without using any chemicals. 4000l clean and drinkable water in a backpack on the go. 2. versatile design: easily set up a diy filtration system by soda bottle like coca-cola bottle, plastic bag, collapsible bottle or bucket. or drink directly from water source like a straw. 3. backflushing with ease: threads on filter both sides. a handy 28mm (1.10in) threads bottle can be screwed on water filter outlet for backwashing. 4. reliable filtering result: 0.1 micron membrane ensures 99.999999% removal rate of bacteria. tuv and sgs testing reports. 5. superior material: fda approved. impact resistance and ultra-light l630 fits in the palm of your hand. lifespan can be extended by backwash.