Steri-pen classic - SteriPEN Classic 3 Water Purifier w/Pre-Filter

I bought this to use during my backpacking and for some others. Looking at the picture, it looked compact but in reality, it was bigger than I thought. Normal alkaline battries are not recommended for this and rechargeable battries with something like over 2000mAh is recommended. This kind of ruined my purpose to use this unit not just for recreational but during the business trip to some counti

This review was written in the old system and had content requirements that are different than reviews written today.