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Grayl Ultralight Water Purifier Bottle

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    18 Reviews


    From Thailand to the Appalachian Trail.

    With its lightweight, food-grade plastic construction and one press purification system, the Grayl Ultralight Water Purifier Bottle offers itself up as an easy-to-use alternative to cumbersome purification systems as you travel or hike. This bottle boasts an electro absorption and activated carbon filter, which removes viruses, bacteria, protozoa, sediment, heavy metals, and particulates. Additionally, the filter processes up to 2-liters per minute, while the convenient 16-ounce size makes it easy to slip into a water bottle pocket, or attach it to your pack with a carabiner. So, all you have to do is fill it up with water, press down the filter as you would your French press, and drink.

    • An easy-to-use purifier for travel or backpacking
    • Electro absorption and activated carbon filter offers clean water
    • Press purification system processes 2L per minute
    • Removes viruses, bacteria, protozoa, sediment, heavy metals, and particulates
    • Filter is replaceable after 300 uses
    • Boasts a carabiner loop to attach to backpack
    • Item #GYL000H

    Tech Specs

    polypropylene, food-grade silicone, ABS food-grade plastic
    Purifying Element
    electro absorption, activated carbon, silver treated zeolites
    protozoa, bacteria, viruses, sediment, chemicals, heavy metals
    Cartridge Life
    300 times
    16 oz
    [per minute] 2 L
    9.6 x 2.8 x 2.8 in
    Claimed Weight
    10.9 oz
    Recommended Use
    backpacking, camping, travel
    Manufacturer Warranty
    10 years

    Tech Specs

    • Reviews
    • Q & A

    What do you think about this product?

    Have questions about this product?

    Great for Hiking and personal hydration

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

    I like this water bottle. First impression of the water bottle is that is doesn't hold as much water as expected. Still works great.I would recommend this for hiking a personal trips. If you are needing to filer larger quantities of water then this might not be enough. I got this bottle for backpacking trips and traveling to foreign countries. Avoid contaminating the lip of the bottle with unfiltered water since you do have to remove the lid to push down. You do have to use a bit of force to push down, but it wasn't as bad as I thought. I would recommend this for backpacking essentials

    Day trips and backup, YES!

    • Familiarity: I've used it several times

    The concept of this bottle is wonderful. Having your water bottle and filter in one effectively decreases the amount of gear you lug around. This has accompanied me on many long day hikes where the 2 liters in my water reservoir wasn't going to cut it but I also didn't want to carry my filter up.

    I would not recommend this for over night backpacking trips as it only filters 16oz at a time. Although the filter could handle 2 liters per minute the process of filling, pushing, and emptying the canister will take longer.

    Does the job

    • Familiarity: I've used it several times

    Overall I'm not really impressed by the Grayl. I do like that it pulls out Chlorine and a lot of the Fluoride in the city water but it is extremely difficult to push down. Also, the lid has to be off in order to push it down and you end up putting your hands on the lip of the water bottle. I think the idea they have going is great but some improvements could definatly could be made. If you are not in the city and don't need to get rid of the Chlorine or Fluoride then I would recommend something that is easier to use such as the Lifestraw.

    My new favorite

    • Familiarity: I've used it several times

    The Grayl Ultralight Water Purifier Bottle is my new favorite water filter/purifier. I love this easy and convenient. I use it backpacking and on bike rides.

    Loved so much it was stolen!!

    • Familiarity: I gave it as a gift but have feedback to share

    I bought my daughter this and she took it to a research convention and it was gone. I had to buy another one because she cant live without it :)

    Daughter loves this!!!!

    • Familiarity: I gave it as a gift but have feedback to share

    Bought this for my daughter for when she goes hiking,camping and caving. Shes currently going to school to be a biologist and hikes often doing research. Loves that its lightweight.


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

    What a great invention. For full disclosure, I haven't actually used this, but I'm heading down to Peru and I'm stoked to be able to get quick drinks out of the sink or the stream. The construction looks solid, and it filters fairly quickly. I'll give a more thorough review once I've determined I won't be developing typhoid.

    New Favorite Bottle

    • Familiarity: I've put it through the wringer

    I have backpacked and hunted with the same Nalgene bottles for over 20 years and never thought about it. With the introduction of the Grayl filter bottle....things have changed. Instantly purify drinking water and have a container to carry it it? YES PLEASE!!!


    • Familiarity: I've used it several times

    Picked this up for a recent trip to China. It worked great for places where I was sketched about the water... I never had any "problems". This version is a lot lighter weight and the filter lasts longer than the previous one I had, which is nice. And it fit in my bag nicely. I also plan on using this for day hikes and maybe even backpacking trips.

    A Bottle of Purity

    • Familiarity: I've used it several times

    I have tried a variety of water purifiers through-out my time exploring and experiencing nature, with this design being my favorite water purifier. The push filtration system is quite easy; you just put it on a hard surface and press the top down, with the bottle sliding down and forcing the water through the filter itself. The filter is a great quality and purifies bacteria, viruses, chemicals, and sediment which is key. It is the size of a normal water bottle and does allow you to store the purified water in the bottle, but that does add a bit of weight to it. I paired it with a collapsible water bottle for easy storage of the purified water. Over-all this is one of my favorite water filters I have ever used, and it has now become my main water filter.

    A Bottle of Purity

    Ultralight in weight, not in function.

    • Familiarity: I've used it several times

    This is an awesome filter with unique function that seamlessly integrates a bottle.

    Those crafty enginerds over at Grayl have somehow managed to combine a water purifier and a water bottle into one sleek package. 3 simple parts are all you have to deal with in normal use; the screw on cap, the outer bottle, and the inner sleeve with the filter attached. Use is simple. It is 4 easy steps. 1-Remove the inner sleeve from the outer bottle. 2-Remove the cap from the inner sleeve. 3-Add water to the bottle up to the line. 4-Press the inner sleeve into the bottle. It is very important to remove the cap, or else good luck pressing the inner sleeve in. You only get a little less than .5L per filter. I wish it held more. They claim 2L/minute filtration rate. From what I have seen this is a little optimistic. You would also need an additional bottle to pour the filtered water into. You must empty the Grayl Ultralight Bottle before you can filter more water. It is taller than the standard Nalgene bottle, but has a much smaller diameter.

    The instructions say to place the bottle lower than 20 inches or on the ground. One may ask, "why is this?" I don'€™t know the scientific reason, but I would assume it is because a substantial amount of force is required to press the water through the filter. The lower it is the more you can use your body weight to drive it down. I will confess that I once filtered water while it was on my counter. It is possible, but not recommended. Once filtered you can screw on the lid and use it just like a water bottle. The numerous seals kept the water in the bottle and kept my pack dry even after hours bouncing around. Hopefully the seals hold up over time and don'€™t develop any leaks as there are a number of them. Also the is a little unfiltered water between the outer bottle and the inner sleeve. While it does not really affect anything it is of note. At times the lid was a little difficult to remove because the carabiner clip on the lid does'€ not provide much leverage and there isn't really anywhere else to grab the lid. At under 11oz this filter/bottle combo is pretty light. While I haven't had to change the purifier cartridge out, the process seems pretty straight forward and easy. The purifier is good for 300 uses or about 150L. So you many want to stock up on cartridges before the apocalypse. The cartridge cost is about the half the cost of the entire Grayl Ultralight. The Ultralight does filter out viruses, which is something hollow fiber filters don't. This is a very nice feature, especially when traveling outside of the country.

    -Simple filtration process
    -Removes viruses, as well as bacteria, protozoa, sediment, heavy metals, and particulates
    -Durable, minimal parts

    -Short filter life
    -Expensive filter replacement cost
    -Requires fairly force to press the inner sleeve to filter the water
    -Must be emptied before additional water can be filtered.

    The Grayl Ultralight is great for travel. It also works wonderfully to use day to day to filter questionable tap water. I don'€™t think it would be the best choice for backpacking or backcountry travel, but it would work. It is a convenient filter with some unique features. The price is fairly reasonable, but the purifier cartridge cost is rather steep considering its life span. I like this product and will continue to use it especially when traveling. It is nice just to be able to grab the bottle and already have a filter within. Anywhere you see some water you can grab a drink.

    Ultralight in weight, not in function.

    Good quality just not right for me.

    • Familiarity: I've used it several times

    I really like the idea of all in one filters. Unfortunately for me this one just wasn't a good fit. I really liked the feel and quality of this filter and it definitely seems like it will hold up in the long run, but for me it was a bit heavy and actual water holding capacity was fairly small which resulted in having to frequently re filter water which would not be an issue if you typically are around water but if there are long stretches between water sources it could become an issue. The amount of pressure required to press down and filter the water was enough that you had to find a rock or something hard enough to push down on in order to create enough force to push the water through the filter.

    This is an extremely well made product and if you tend to hike close to water where you won't be needing to have a large holding capacity then this would definitely be something you should think about getting.

    Good quality just not right for me.


    • Familiarity: I've put it through the wringer

    This thing is awesome! I mean what'€™s not to like? It's portable, light and easy to use. I love the fact that I can take a walk by the lake or by a river and not have to worry about bringing enough water along. It definitely lightens the load. Also, besides the fact that it's convenient, lake and river water is so tasty! I always thought "Tahoe tap"€ was delicious... but actual Tahoe lake-water? So amazing! And it"€™s really nice to be able to drink it without having to worry about potentially getting a GI track infection or anything like that. I can only imagine the implications for traveling! Anytime I’m in a third world country I cringe at the number of plastic water bottles I have to buy. I can"€™t wait to take this on my next trip to South East Asia. My friend took hers along this spring and said she never had to buy plastic water bottles anywhere she went. My wallet and my conscious both like the sound of that! I only have two "cons"€ (in quotations because they really aren'€™t major problems to me). One would be that the bottle only carries about 16oz of water (just shy of 500ml or half of a regular sized Nalgene bottle). It'€™s easy for me to drink that in one go but hey, if there is water nearby than there is always free refills! The other is that it does take a little bit of effort to get the filter to press down. You know though, when I compare it to my other backpacking filters its not more challenging. Regardless it still takes less than a minute to pull the filter out, scoop up the water, and press the filter back down. Overall I am ecstatic with this product so far. Its definitely got its fair share of adventures this summer!


    A Game Changer

    • Familiarity: I've put it through the wringer

    I've used this Grayl Ultralight purifier in a number of settings and definitely appreciate the ease of use with it and the functionality. Originally when Grayl launched their products I was pretty excited but a bit hesitant over the weight of most of their products. Then they came out with the Ultralight which made this a usable product as its 10.9oz. I've also used a range of other purifiers and filters for various types of scenarios and definitely have some I prefer depending on the situation but the Ultralight has definitely found a spot for my water treatment.


    At 10.9oz's this is now in line/lighter than bulkier filters/purifiers. I've used a range of others that are cumbersome and heavy but this purifier now can add less weight to my pack for backpacking trips.

    Quantity of Water:

    This is where I'd say there is a slight short coming of the product with the limited volume of water you can purify at a time. But realistically this doesn't bother me because I can just keep purifying more and more water as long as I have another water container to put my purified water in.

    There is a little line inside of the Orange/Grey "dirty" cup that indicates the max amount of water you can purify at a time before spilling out of the clean cup.


    I've used this backpacking, which i really enjoyed that I was able to purify and store the water in the same container. No need for managing clean hoses and dirty hoses. I'm not a fly fisher but I did head to the river one day with a buddy to fish and it was pretty awesome that while he needed to predetermine how much water he was going to bring I just brought the Ultralight bottle and just kept purifying more and more water as I needed it. Another day I floated the Weber rive and had this on me and just purified water as I needed it.

    So for those that float the river, fly fish, or anything thing done close to fresh water, this would be a great bottle to have on you.

    My parents boat a ton and this is a product I could see them using. Rather than filling up a gallon of water or bringing bottled water, they could just have this product and purify as needed.


    After each use I pull the filter out of the bottle and let it air dry rather than storing it wet. Then once its dry I just put the unit back together and put it on my shelf with the rest of my water treatment options.


    At first it seemed like I had to put a ton of pressure to purify the water but then eventually I got the hang of it and keeping the lid cracked open is key since the air inside the clean bottle needs a way to escape the cup since you'll be filling that volume with purified water.

    After using this a ton I'd highly recommend it to anyone looking to treat water or those that are constantly near water and looking to have purified water handy.

    A Game Changer

    Yummy water everywhere you go!

    • Familiarity: I've put it through the wringer

    This bottle goes everywhere with me. It's convenient in all situations: camping, around town, road trips, at home and everywhere else. If you are a fisher, surfer, backpacker or day hiker, you need this bottle!

    The purification system works like a french press. It can be confusing for first time users, but is actually really simple! To filter the water, take the bottle apart so there are two pieces, fill the orange or black part of the bottle with water, then press the part with the filter down into the bottle. As the water presses up, it goes through the filter and before you know it you have delish, filtered, safe water!

    The bottle is extremely lightweight so it can be used backpacking. All you need is a water source and you have on-the- go fresh water. The filter lasts about 300 uses, I use mine on the regular and replace the filter once every few months.

    The bottle is also easy to clean. I wouldn't put it in the dishwasher, instead remove the filter portion and just lightly hand wash it with soap. I also try to let the filter air dry every once in awhile so it doesn't get smelly.

    I've been in many situations where I'm so glad I had my Grayl. It makes any water taste better, especially on road trips when you only have nasty gas station water!