The SteriPEN Fits-All Filter effectively removes particulates from water with the use of a durable 4x4 micron screen. Its unique design, featuring the filter cup and funnel fit, offers flexibility to filter water into bottles with a wide range of mouth sizes, including narrow-mouth bottles such as commercial water bottles, soft-drink bottles, canteens and SIGG™ bottles. On wider-mouth bottles, such as Klean Kanteen, Gatorade and Nalgene bottles, only the cup is necessary.
Water can be poured through the Fits-All Filter or you can submerge the combined Fits-All Filter and bottle of choice. Weighing only 65 g (2.3 oz.), the Fits-All Filter is made with rugged, flexible materials that allow the filter to be squeezed during storage and return to shape when unpacked. Nested storage dimensions are 88mm (3.5 in.) x 95mm (3.7 in.) x 72mm (2.8 in.).
We like simple ideas, and Steripen's Fits All filter is one of them, in order to fit any size bottle - from tiny openings to wide mouth - you need a funnel. That's the basis of this product, the filter sits inside the funnel which can then be slotted into virtually any sized opening.
The funnel does have a special diameter section which fits neatly into a standard wide mouth bottle as this is one of the most popular sizes. The wide end of the funnel finishes in an oval shape which makes it an easier shape to store.