Thanks for that bit of info. I had been looking at the hiker pro last summer but was kinda having second thoughts due to it's size, not that it's thaaaaaat big a deal. When comparing it to the Steripen + batteries, what are we talking in weight and size differences. Let's say we're talking a 3 day, 2 night trip when figuring on battery consumption. Also, I noticed that Steripen has a multitude of models. My water consumption is around 5 to 6 liters per day on a hot day. I'm going to take your advice concerning the Sweetwater 'cause my luck would be that I break it on the first pump and I've learned to take the advice coming from Campmor. Thank you again for continued thoughts on the subject.