• MSR - AutoFlow Gravity Filter - null
    MSR - AutoFlow Gravity Filter - Detail
  • MSR - AutoFlow Gravity Filter - null
  • MSR - AutoFlow Gravity Filter - Detail
MSR - AutoFlow Gravity FilterView Larger Image

MSR AutoFlow Gravity Filter

Temporarily Out Of Stock

Don't get too bummed. This item is on the way and will be available for purchase as soon as it rolls into the warehouse.

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Tech Specs

This product can expose you to chemicals including styrene, which are known to the State of California to cause cancer. P65Warnings.ca.gov
hollow fiber
Purifying Element:
bacteria & protozoa, sediment
2L, 4L
1.75L per minute
Field Cleanable:
[2L] 8.5 x 15in, [4L] 11.3 x 20in,
Claimed Weight:
[2L] 10oz, [4L] 11.1oz
Recommended Use:
hiking, camping, backpacking
Manufacturer Warranty:
limited 3 years

Let gravity do the work.

Collect, filter, and store your water in the backcountry with the quick and convenient MSR Autoflow Gravity Filter. This field-cleanable filter lets gravity do the work and cleans nearly two liters of water per minute. The four-liter reservoir holds enough hydration for your whole group, and the adapter end piece fits onto most standard water bottles and reservoirs. It's field cleanable, too, so you can remove all the bacteria, protozoa, and sediment that's been filtered out and have a filter that's good as new in minutes.

  • Gravity filter for easy cleaning of drinking water in nature
  • Filters out bacteria, protozoa, and sediment
  • Quick filtration gets you 1.75-liters per minute
  • Tool-less cleaning makes it easy to clean in the field
  • Filter directly into most any bottle
  • Reviews
  • Q & A

Way Easier than a Pump Filter

  • Familiarity: I've used it once or twice and have initial impressions

Love this filter - just remember to store it carefully as it's not the most durable! Super easy filtering though, very happy with my purchase.

Had to return

  • Familiarity: I returned this product before using it

Bought this for a trip to Kings Peak but it came missing one of the tubes so had to return to the manufacturer. Didn't have time to order a replacement so used a friends filter on that trip. Will probably re-order this again given how great the feedback seems to be.

Recommend for all kinds of trips!

  • Familiarity: I've used it several times

I've used this filter for larger group trips to just a 2 person trip and I love it! I can cook and set up/break down camp while this takes care of water for me. It has a pretty fast flow and it's pretty light to carry. I would say this is the perfect water filtration except I've only used it on trips near lots of water. I imagine if you come along a smaller pothole of water in the desert, this isn't ideal, but otherwise, a great product.

Fast Agua

  • Familiarity: I've put it through the wringer

I converted from hand-pump water filtration to gravity filtration last year. It's a great switch, take the plunge!

This filter is super fast and easy to use. Filters last long and I often 'backwash' the filter by lifting up my Nalgene and forcing water to backflow through the filter for a few seconds. This filter will easily get you a couple liters in 5 minutes. This filter helps me stay hydrated in the backcountry since I don't have to dread hand pumping water anymore. I used the Katadyn Hiker Pro pump for years before this and was disillusioned with the amount of waste it created due to frequent filter changes. The gravity filter is faster and a more sustainable choice.

The type of plastic used for the bag is super durable and can handle abrasive surfaces (i.e. granite). There's a webbing loop on top of the bag that you can clip on to a tree branch so you don't need to hold the bag to filter water.

Fast Agua


    The main thing that drew me to this was how quickly it can filter water. I've used it once and it worked like MAGIC!

    Quick and Easy

    • Familiarity: I've put it through the wringer

    This filter is awesome! I have been using this for a couple years and it still is working great. To help make it flow a little faster get the water down the tube to the filter and once the filter is wet it will start flowing a lot faster. Grab the water, hang it up, and let it flow! Then go set up your tent, grab your snacks and relax.

    Gravity! The Best Assistant

    • Familiarity: I've used it once or twice and have initial impressions

    Works well and isn't challenging to use. Make sure to follow instructions carefully and keep this clean and nice. Setup doesn't take long, I can see it being a little less enjoyable if the weather isn't great though. When comparing with other water purification tools like Life Straw and Iodine this is definitely the way to go.

    Water Boy

    • Familiarity: I've put it through the wringer

    This is exactly what you want for Base Camp water needs or for trips with a big group. Myself and 7 others only used this filter out on the Na Pali Coast across 3 days and it was everything we could ever need. Thoroughly impressed with the filtration and how much water you can get in such a short amount of time.

    If you have questions about this filter please reach out!

    Water Boy

    Very good

    • Familiarity: I've put it through the wringer

    Very nice to be able to fill the bag and fill bottles or bladders as needed. Worked great at elk camp for multiple people. One thing to consider is that in freezing temps it really slows down or doesnt work at all until the filter element warms up or is thawed out. Seems obvious but it was not something I had considered for this trip. I’d also consider getting at least one more filter for longer trips with multiple users sharing it. I have no complaints over the function of the product and I didnt end up with any water borne illness or infections after drinkin gallons of back country water.

    If it freezes then it cracks and is no longer safe to use. If it’s gonna be freezing then take the filter off and put it in your sleeping bag at night. You were lucky you didn’t get sick and need to replace your filter

    good volume to energy expendeture ratio

      MSR's gravity filter helps streamline lightweight backpacking setups and conveniently cuts out time spent pumping water upon making camp.
      MSR's gravity filters have a well-deserved reputation for quality, and while I think that there are a lot of good water filtration systems out there, there aren't many that accommodate such a large volume, and require so little work.

      Very Convenient

      • Familiarity: I've put it through the wringer

      I bought this filter to be used while working for the Forest Service In Idaho. I ended up choosing this filter primarily because I was looking for an alternative to pumping water. I mean does it get any easier than using gravity to filter water? Sign me up.

      I really like the ease of filtering. All you have to do is fill the bag roll the top and hang the bag up in the tree and you are good to go. This bag is definitely really convenient but does have a few downsides.

      To start off it is heavier than other non pump options. The other downside is having a place to hang it up which can be tricky in some environments.

      Overall this is great filter for the right environment.

      Mr. Clean

      • Familiarity: I've used it several times

      I've used pump filters and steripens and then this gravity filter. Life changing. Steripen works about 50% of the time, not worth it. Pump filters are great if you want an arm workout after a hike or are melting snow.

      If you want to filter water for a group of 4 while backpacking, get this. Easy to set up, use, filter, clean. Took a couple tries to get right, and occasionally my dofus friends would get air bubbles in it which slows things down but if you follow the directions, you'll be filtering water with ease in no time.

      Took this on a 3 day backpacking trip through the Enchantments in WA, group of 8 and this was all we used. No one got the runs.