Beware - it's not waterproof! - SteriPEN Adventurer Opti Water Purifier

I bought one and sent it back, it's a flawed design.

1. It's not waterproof! Read thru-hiker recommendations online: everyone starts with one of these, then it fails in the rain. I called the factory, they do not guarantee it against being dunked! How crazy is that?
2. You can't use it without spreading contaminated water everywhere by virtue of the fact that it does not seal the bottle while you stir. I saw seals for sale somewhere, who needs the hassle?
3. The battery box door is not well made or well designed.

Great for tourists in hotels!

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