Best Overall · 1 of 5
SimPure Portable Gravity-Fed Water Filter with 3L Bag

- 3 L bag, 2.8 oz filter
- 0.1 micron UF plus carbon stages
- 5,000 liter lifespan
Our take
A hands-free gravity set with a long life and a light bag.
Why it made the shortlist
The SimPure is a gravity-fed set with a 3 liter TPU bag and a filter that stacks a 0.1 micron hollow fiber ultrafiltration membrane, a 5 micron coconut shell GAC filter and a 0.2 micron PP fiber filter. The listing gives a 5,000 liter (1,320 gallon) lifespan and a flow of 27 liters per hour, and the filter weighs 2.8 ounces.
It filters hands-free once you hang it from a tree strap, which suits group camp chores more than the straws. The filter can also be used as a personal filter, or with a 29.5 inch extension tube for more distance.
It suits campers who want filtered water for cooking and bottle filling without pumping or squeezing. The tree strap keeps the bag hanging while you work.
What works
- Hands-free gravity filtering
- 5,000 liter lifespan listed
- Carbon stage for taste
- Light enough for a pack
Watch out for
- Needs a place to hang the bag
- Slower than a pump
- The catch
- You need a branch or hook, and a 3 liter bag fills slowly.






