The set comes with one squeeze screw-on water filter, two 32-ounce collapsible pouches, one replaceable pop-up drinking spout, and one syringe filter cleaner. It weighs three ounces. It removes bacteria such as salmonella, cholera, and E. coli, and protozoa such as giardia and Cryptosporidium.

Note: If you’re immunocompromised, be sure to read all the package instructions to make sure it’s safe for you.

I adore this water filter for its ease of use, adaptability, small size, and zero wait time. Just fill the bag, screw on the filter, and roll the bag to squeeze the filtered water into your bottle. You don’t need to wait for it to be done like with water treatment pills or gravity systems, and there’s no funky taste — just fresh, clean, crisp water. If even the bag-filling situation sounds like it would take too much time, you can also screw the filter DIRECTLY ONTO A WATER BOTTLE and drink straight from it. Game-changing. Either way, it’s a quick, lightweight system that I completely recommend.

Promising review: “This thing is awesome, used it on our 3,500-mile trip stopping at various hiking spots and trails and camping, and having clean drinking water you can trust when on a long trip is vital. This gave me peace of mind that no matter where we filled up, creek or random water spigot, we had clean drinking water. The cleansing tablets are a must for outdoor on-the-go water sources but with this system you don’t have to carry a lot of heavy water in your pack to slow you down. A friend of mine used this hiking on the entire Arizona Trail and some of the water he used in it. I wouldn’t have let a dog drink but he did and this thing worked like a charm and cleaned the water for him to safely drink throughout the desert on his hike. From that point on I was sold.” —Combustion Works

Get it from Amazon for $45.99.