If you want to trek into the wilderness with nothing more than a pack on your back, then you need to have the right supplies. Carrying too much with you will make things very unpleasant very quickly, and one of the main things that will weigh you down is water. You definitely need it to live, but you can’t exactly carry a week’s worth in addition to what’s already in your bag. Your only option is to drink water found in the wild, but that isn’t always the cleanest to drink from. If you want to zap all the little nasties in your drink, you’re going to want a quick and easy way to purify water.

The LifeStraw Personal Water Filter is a direct line between you and fresh water. It can filter 264 gallons of water, removing 99.9% of waterborne bacteria and protozoan parasites, and only weighs two ounces. It doesn’t need batteries, and has no moving parts that it can destroy from prolonged use. You will need to suck on it for 3-5 seconds before you get anything out of the straw, and blow back into it to clean out the filter. This will cost around $20, and will be useful for campers, hikers, Boy Scouts, and general outdoorsy-types.