The Classic is the workhorse of the SteriPEN family. ItÂ’s a product that you can consistently rely on for its ruggedness and performance.

• The Classic is also the SteriPEN that gives you the longest battery life. Using four AA lithium batteries, the Classic gives you the power to purify an incredible 200 half-liters of water with a single set of batteries, providing you with that extra confidence to know that youÂ’ll have access to safe drinking water whenever youÂ’re hiking or camping in the wild.
• Like Journey, SteriPEN ClassicÂ’s tapered end provides a snug fit with water bottles, and with the SteriPEN Fits All Filter, works even with wide-mouth water bottles.