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  • Platypus - GravityWorks 2.0L Filter System - Reservoir Kit - One Color
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  • Platypus - GravityWorks 2.0L Filter System - Reservoir Kit - One Color

Platypus GravityWorks 2.0L Filter System - Reservoir Kit


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    14 Reviews


    Pour dirty water in one end and drink clean water out of the other.

    Your hand-pump water filter looks slow and inefficient in comparison with the Platypus GravityWorks 2.0L Filter System. This gravity-powered water filtration system is ultralight, easy to pack, and fast. Just collect dirty water in one reservoir, hang the system, and in just a few minutes the second reservoir will be filled with two liters of clean, drinkable water.  And there was much rejoicing among backpackers.

    • System uses gravity to assist the movement of water through the filtration system, saving you precious energy in comparison to pump systems
    • Inline system passes water from the dirty reservoir to the GravityWorks filter and then down the line to the clean reservoir
    • GravityWorks filter attaches to the dirty reservoir via a quick-release fitting that automatically shuts off the flow of water when you disconnect the hose to disassemble the system
    • Two-liter 'dirty' reservoir has a large, push-seal opening for easy collection from a variety of water sources
    • Two-liter 'clean' Platy Bottle serves as the clean-water collection point in the in-line filtration system
    • Both dirty and clean reservoirs feature a SlimeGuard antimicrobial treatment to control funk, and both are made of BPA-free plastic which makes them safe, easy to pack, and highly durable
    • Two liter capacity is ideal for a solo backpacker with two on-liter water bottles or two backpackers who drink at a slower rate
    • System is compatible with reservoir-based hydration system or standard, water-bottle-based hydration
    • System includes one two-liter collection reservoir, one Platy Bottle with push-and-pull cap, quick-release fittings, one Gravity-Works filter cartridge, one in-line adapter, and hoses
    • Item #CAS0828

    Tech Specs

    Filter Material
    Hollow Fiber
    1.75 L/min
    protozoa, bacteria, particles
    3 x 9.5 in
    Gravity Flow
    Cartridge Life
    1501 L
    Platypus bottles, Platypus water tanks, Platypus Big Zip SL reservoirs
    Claimed Weight
    10.75 oz
    Recommended Use
    backpacking, camping, hiking
    Manufacturer Warranty

    Tech Specs

    • Reviews
    • Q & A

    What do you think about this product?

    Have questions about this product?

    Withstands it all.

    • Familiarity: I've put it through the wringer

    This water filter is a gift from above. It's light, but not very delicate. The durability of all the components, and the ease of use for assembling, disassembling, and operating this filter made this my absolute new favorite. Anybody who is looking for a reliable, reusable filter, who doesn't want to worry about batteries or funky tastes from tablets, needs this. One downside is that after you've put the filter through the wringer, the "dirty" water reservoir starts being difficult when you try to close the zipper. I had to leave the top open on a few occasions and just let it do it's thing. On the otherhand, you don't really need to close the dirty reservoir, and the replacement reservoir are super cheap. I also recommend bringing a soft collapsible platypus waterbottle, It'll attach directly to the clean hose since they're made to be compatible.


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

    I had picked up the 4L version for a long hut trip and decided it was the best piece of gear I owned. I ended up wanting the 2L and about every other product they make.

    Fast & Simple

    • Familiarity: I've used it several times


    This is a great purchase. I mean AWESOME. I had this old filter that required a lot of patience. It was a slow pump and not much water could come out of it.

    I was torn between the MSR & Platypus but I'm glad I got this one because the bottle comes with a cap that can function as a water bottle!

    I think the price point is fair. The only thing I criticize is that there is no strap for the clean water. Why not!? I want my clean water hung up just as much as my dirty water. I assume it is because of the option of making it a bottle..

    Here's my most recent trip locally using this awesome filter:

    Fast & Simple

    Awesome product/ customer service A+

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

    I just started taking multi day hikes and bought a platy. It performs as described and does it job well. Buy!!! Big shout to backcountry. I was a longtime time rei and evo dude but the last year i've made the switch to backcountry. The customer service is the best, the prices competitive and selection is enourmous. Having your own gearhead who actually pursues their own passions that our the same as yours was the icing. These people know their products and are honest. My only regret was I didnt make the switch earlier. Oh yeah, the other site they run steep and cheap is just as good and like the rei outlet ive found killer bargains. Not putting other outdoor stores down but backcountry is where it is at. Until I cant find the gear I need ill be buying from backcountry. The only thing that could make it better would be if they sold more core ski brand related products but I can live without my on3p t shirt....for now.

    Light and effective water filtration kit

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

    I used this kit on a two day hike with five people. filtering water from tanks at hiking huts on the Bibbulman Track in Western Australia. The kit is lightweight and the filtration rate is fast. The adaptors fitted all of the many and varied water bottles and reservoirs that the group had. The water was effectively cleaned of tannin colours and was sparkling clear. I will be using this in future instead of my other water purification methods. The clean bladder will be my hydration pack to save even more weight.

    Tired of the pump? This is your answer!

    • Familiarity: I've put it through the wringer

    The Platypus Gravity Works 2.0L Filter System - Reservoir Kit is the way you want to go after a long backpacking trip. Filling the dirty bag is so easy and you just let gravity do all the work. It is easy to clean, very light weight, and is well marked for dirty and clean hoses. I do over 100+ miles backpacking a summer and this is my filter I use. It is nice because you have water on tap in camp. You can filter anywhere, not just where you would use a traditional pump filter. Easy maintenance, easy to use, equals happy camping. I am over the pump, and after you try this filter you will be too.

    Go with GravityWorks 4.0L system instead

    • Familiarity: I've put it through the wringer

    First off, I think Platypus GravityWorks Filter Systems are the bomb! I give this 2.0L Filter System a 2 star, or "not recommended", rating only because I think the GravityWorks 4.0L Filter System is the best backcountry filtration system out there (see my separate review of that excellent product)!

    Reason: For virtually the same weight, cost and space in your pack, you get the flexibility to manage up to 8L (with the 4.0L system) vs. only up to 4L (with the 2.0L system) - again, see my review of the 4.0L system.

    It seems as if the usefulness of the 2.0L system is for day hikes (and it's presented that way in at least one Platypus product video). In contrast, the 4.0L system can be used for day hikes AND overnights AND weekend trips AND week-long trips, etc.

    Reviewers Note: Upon re-reading's product description above, the 2.0L product would be a good choice for solo backpacking adventures. But, for all the reasons I've outlined above, I still recommend the 4.0L system.

    NEW! Platypus GravityWorks Filter

    The reviews keep coming and one thing is clear: the Platypus GravityWorks water filtration systems are changing how people filter water. Whether you're backpacking, car camping or even on a day hike, an ultralight and compact GravityWorks System lets you say goodbye to pumping and everything else you ever hated about filtering water. Just fill it, hang it and get back to enjoying while gravity and our advance hollow fiber filter deliver clean water at up to 1.75 liters per minute. Welcome to the future of filtration.

    great passive filter

    • Familiarity: I've put it through the wringer

    The filter works ok, it filters about a liter a minute. Comparing this with a MSR sweetwater filter, the sweetwater was faster and the water came out cleaner. This is a great passive filter, you just fill it with water and walk away. Make sure it does freeze.

    Milli Vanilli said blame it on the rain

      But the Barenaked Ladies said "if you blame it on the rain what can be gained so, if all else fails you can blame it on?.. [Sawyer's water treatment system]".

      Yes that is right, Sawyer. Had it not been for the pure awesomeness of a similar style gravity filter system by Sawyer, I would blame my Platypus water treatment system's difficulty purely on the rain. Why?

      An exceptionally rainy year this past field season (I guide research expeditions in Mongolia) deposited a lot of silt into the rivers/streams in the remote valley of Mongolia where we were working. Although it was nice having a wealth of water for bathing (something we had not enjoyed in the past), the overload of fine silty sediment really clogged my Platypus system, resulting in daily cleanings by the end of the project.

      (As a side note the system is easy to clean via back flushing, but does waste time and water).

      I was more than willing to excuse the poor performance to the overload of silt; however, a member of the research team was the proud owner of a Sawyer water treatment system? a system that never once had any difficulty or reduction in flow capacity. Their system filtered water just as fast on day 30 as it had on day 1. Weight or filter life be damned, next time around I recommend a Sawyer.

      Milli Vanilli said blame it on the rain

      NO pumping. FAST.

      • Familiarity: I've used it several times

      I recently purchased a 2 L Platypus, and I have used numerous times on a few backpacking trip. Took the Platy on a 2-day 25 mile backpacking trip in MI, on the Manistee River trail loop. I used it numerous times on some fast moving fresh water creeks. It worked beautifully! It was very simple and easy to use. The Platy filters water incredibly fast. Just fill the bag, hang it up, and watch it filter. NO pumping. Just make sure you back flush the line to clear the air out of the lines or it will slow the filtration rate. I have yet to use the Platy on any very cloudy or darker water, so I don’t know how it will perform on water like that. But I would try to avoid water like that to ensure a longer filter life. My only complaint thus far is the bag it came with. The carry bag is a little snug to put all the tubes and filters in. Other then that, I highly recommend this product to anyone.

      NO pumping. FAST.

      original system is better.

      • Familiarity: I've used it several times

      I am not sure i understand what Platypus did with this system, but i am not crazy about it. My friends have the original, which has screw cap interface for the clean bladder. This screw cap interface works with all of my Platy bladders flawlessly. But this 2.0 system has the multi-plug pieces that are great for a nalgene, and work OK for others - OK specifically for the Platy blatters. That's really irritating. I like the set and forget practicality of the old system. Going to have to rig up a screw cap from a replacement hose (for $13 bucks!) if i want the best system.

      On the brightside, the nalgene screwtop can be used with a hose to fill from a nalgene (e.g., reverse the flow). I like this because i normally use a steripen rather than this filter.

      Otherwise, this is an excellent, lightweight filter for multiple people. It's a lot for a solo hiker, but excellent for a group.

      Perfect for filtering water for a group

      • Familiarity: I've used it several times

      I bought this filtering kit for a group backpacking trip. This way we would not spend a lot of time down by the river pumping water.

      This was an amazing addition to our camp site. I bought the 1 gal reservoir jug to always have water around, especially while we were cooking. This way we got to spend a lot more time hanging out with each other as a big group and no one was stuck squatting by the water trying to pump water into their nalgene.

      Just open the dirty water bag, clear off a layer of bugs and floaties on the water and dunk the bag. It seems like three swipes of the bag into the water gets it full. then connect it to the filter hose and the water flows into the clean reservoir. after a few seconds I definitely recommend lifting the clean reservoir above the dirty bag to get all the air bubbles transferred to the dirty bag to make it flow faster.

      Compact setup

      The whole kit is very compact. The size of the package is enough to make you wonder if it really does have everything it says it does. .... it does BTW. The two 2L reservoirs fold up into almost nothing making this super compact for a 2L system.

      Compact setup