The RapidPure Purifier+ Insulated Bottle allows for fast, effective water purification as you drink no pressing, squeezing, priming, or backflushing required. The proprietary insulated double-wall stainless steel bottle features our new POD platform using UltraCeram and OpenPore technology for protection against viruses, bacteria, parasites, and more. Compatible with most wide-mouthed (2.5in/63mm) water bottles -- use with your favorite bottle!