If you’re considering the Trailshot, be sure to look at the Trailshot Gravity kit. It functions like the plain Trailshot on the trail, as a simple pump-and-go filter. However, it also has a “dirty water” container that can attach to the inlet side of the filter to turn it into a gravity system for group or in-camp use. (However, you cannot buy the regular Trailshot and then add the gravity kit later. You need to buy the full system up front.)

I tried the original Trailshot, and decided I prefer the MSR Autoflow gravity filter. However, my niece is happily using the Trailshot.