"Those that carry Steripens, how are you carrying them or what power source are you using? The recent article comparing Steripen to gravity filtration, the author had the rechargeable kind, with solar powered case. The extra battery, plus the case, put the total weight up to 11 ounces if I remember correctly, which is equivalent to my MSR Sweetwater. Didn't seem like such a weight saving for me, and I don't find the time to pump water to be that much of an issue."
Even with a spare set, the Adventurer (the Opti is lighter) doesn't weigh anywhere near 11oz. Mine came up as a hair under 5oz. The two sets of batteries was 2.5oz and the gadget was about the same at 2.375oz, or, a total of 4-7/8oz. As far as I know, only the Adventurer was sold as a rechargable set, maybe the Opti. This should take you about 20 days, easily, even at double dosing cloudy water (much of the ADK's is.)
1) I never use the rechargable batteries nor the case. Just ain't worth it in the forests of
2) Lithium batteries last a bit longer than alkiline, more importantly, weigh 5/8 as much.
3) I am lazy, I hate to fiddle with stuff. Even AquaMira gets annoying...