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  • Insert provides smaller drinking aperture to block splashes while on the go and a larger fill-through drain to add water liquid without removing
  • Opening is sized for both kids and adults
  • Food-grade silicone rubber material won't absorb or retain odors and tastes; can be sterilized by boiling and is dishwasher safe
  • Flexible design is sized to fit wide-mouth bottles from most manufacturers, including Nalgene®, Cyclone™, Bison™ and GSI™


View all Guyot Designs Water Bottle Accessories

REI membership


Best Use Multisport
Material(s) Food-grade silicone rubber
Dimensions 2.2 x 0.5 inches
Weight 0.5 ounce
Rated 3 out of 5 by from Performed well...but tasted like rubber The splash guard fits just right (nalgene) and is very comfortable to drink from. However, as only one other review noted, it imparts a rubber taste to your beverage. I primarily drink water from my nalgene bottle, so maybe it was especially noticeable to me; flavored beverages may fare better. I happened to find another splash guard from guyotdesigns that was made out of plastic (same two-hole design) and it works just as good without the rubber taste. So, I do recommend this splash guard if you are not picky about taste, as it does function well. But if you ARE picky about taste, I would seek the plastic version instead.
Date published: 2010-05-15
Rated 4 out of 5 by from More Comfortable than Nalgene version I must say that I love this splash guard, much more so than the Nalgene version. It helps that it is flexible, and has more grip to the inside of the bottle. I use this with the standard Nalgene wide-mouth bottle, and it bothers me just a little that the fit is not quite perfect. While it performs by preventing splash, there are small gaps between the rim of the bottle and the splash guard right near where you drink, so if you are not careful, you can get a little bit of extra liquid coming out of the bottle and trickling down your face. Basically, it looks like it is puckering just a little bit cause the fit isn't quite perfected. I still like it, but just be forewarned.
Date published: 2008-07-15
Rated 5 out of 5 by from Grown-up sippy cup! This thing could be in an infomercial. A monochromatic person goes to drink from their wide mouth water bottle but spills all over the front of their polo shirt. Arms in the air (spilling more water), disgruntled look on face, impossibly soaked - this is what happens when you don’t use a Splashguard. Enter: Splashguard A group of happy hikers smile and sip water, birds chirping, a troop of children and puppies playing in the background, a double rainbow. It’s a good thing. Fun to use, easy to adjust, and a great canary in the coal mine - when you notice the smile is a tad dingy, it’s probably time to clean your whole bottle.
Date published: 2015-08-16
Rated 5 out of 5 by from Just what I needed! This is exactly what I've been telling my friends I need so I'm glad I found one at REI! I am always spilling water all over myself when I use my Nalgenes so this little guy has pretty much eliminated it. It's possible I'm the only one with this problem, but I would imagine it is good for kids too as they seem to spill about as much as I do :) It's made of a rubbery material and I have had zero problems with it not staying in place or falling out on me. I actually thought it was going to be too small when I first looked at it but it's not, it fits PERFECTLY! Easy to clean and I actually just put it inside my Nalgene when I'm not using it.
Date published: 2012-04-08
Rated 5 out of 5 by from no SPLASH here! I am a teacher as well as the Health Supervisor at a Day Camp. This product is great, I have recommended it to many camper's parents this summer. I freeze my water bottle over night. My favorite part of this product is that it prevents the big ice from sliding down the bottle and bumping me on my lip as I drink. I can drink faster w/ out being careful. I have noticed that I and my campers drink a lot more water with the splashguard on. Great to stay hydrated. It's simple to take off and put on for refilling/ washing your bottle. I think kids enjoy the designs which is another way to keep them interested in staying hydrated-with frequent swimming it's often difficult to motivate kid's to drink water b/c they don't realize that they need it/ they feel cool.
Date published: 2010-07-13
Rated 4 out of 5 by from One major problem These really are a great product. Who knew such a simple little piece of plastic could be such a great idea. It helps control the flow a lot, so there's less risk of splashing or spilling. Unfortunately, at least for myself and my wife, if you don't clean them VERY often, they develop some kind of mold-looking stain. Your mileage may vary. Thankfully they're easy enough to scrub with a toothbrush and pop in the dishwasher, but stock up on these all the same. They could probably improve this by adding an anti-microbial coating.
Date published: 2012-12-10
Rated 5 out of 5 by from Easier to Sip While on the Go Trying to drink out of a large mouth bottle while working out was always a challenge (especially while on a treadmill!) and having the splashguard makes it a thousand times easier. It did, however, ruin my boyfriends fun as he is no longer able to tap the breaks and laugh as I spill water all over myself. 10 / 10 for saving my dignity at the gym and in the car.
Date published: 2016-10-27
Rated 5 out of 5 by from works fantastic! It is an awesome invention! I have a couple of REI nalgene wide mouth bottles and these just work perfect, especially when I'm on the move or driving. prevents water from splashing all over the place for sure. It's durable. I've used one daily for over a year until I lost it after taken it out to let a friend borrow the bottle. I currently have two. I've washed them in the dishwasher multiple times. I do notice that they don't fit as tight after the heat dry cycle. They still works though.
Date published: 2013-03-16
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Does the splashguard fit a 32 oz Hydro Flask?

Asked by: Scout334
Yes, the Guyot Designs Splashguard will fit any Hydro Flask wide mouth bottle with an opening that measures 2.19 inches in diameter.
Answered by: REIservice
Date published: 2017-03-26

I have a question regarding your production of splashguards. I am looking to buy a couple hundred of these, and would like to know if it is possible to have them personalized with a school logo. Please let me know if this is an option!

Asked by: NaomiA
We do have the ability to put personalized logos on some products that we sell. We recommend contacting our Corporate and Group Sales Department directly for more details.
Answered by: REIservice
Date published: 2017-04-28

Does this fit a Columbia Quickwater 1.1-Liter Sports bottle?

Asked by: Casey
This splashguard is designed to fit most wide mouth water bottles. If the diameter of the mouth of your water bottle measures 2.1 inches, this splashguard should work.
Answered by: REIservice
Date published: 2016-12-30

Will this fit in a lifeline fifty/fifty?

Asked by: Funkytownman
The Splash fits bottles with 63mm openings.
Answered by: REIservice
Date published: 2016-06-10

Does anyone make a splash guard for the pint size Nalgene bottle

Asked by: StationLady
This splashguard will fit onto a wide mouth 1 pint Nalgene.
Answered by: REIservice
Date published: 2017-03-07

Anyone have any ideas of how to prevent mold from growing on it? Obviously besides washing it everyday. I leave my nalgene open to breath throughout the day, so it's not like it's been baking in it's own germs.

Asked by: champee
The keys to preventing mold are making sure it is completely dry during storage and kept well ventilated. You should continue to monitor the indoor humidity.
Answered by: REIservice
Date published: 2016-10-31
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