The RapidPure Water Purifiers get the job done! It's not a water filter, it's a purifier. There is a big difference. When you are out in the wild you don't know what's in the water source. Filters remove viruses and bacteria, but not chemicals, heavy metals, or pesticides. A purifier removes all these nasty things. Pesticide runoff into streams and lakes is a big problem. Let's not even talk about what's in the ditch water next to the road. I always use activated carbon as a pre-filter to remove this nasty stuff and improve the taste. The RapidPure has activated carbon built in, silver too, so you don't need to pre-filter. The RapidPure exceeds US EPA water purification standards. It's also freeze resistant. If those micro tube filters freeze the tubes break and the filter is junk, not the RapidPure. If you are concerned about things in the water that filters don't remove, then the RapidPure is for you! They come with a bottle, without a bottle, as a straw, or as a volume drip. You can get them in the Essentials -> Water section in the store.