The Best Splash Guards for Hydro Flasks, Nalgenes, and Other Large Bottles

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Have you ever been driving along on a hot summer day and need a sip of water, and when you go to take a drink from your wide mouth bottle, all of a sudden you hit a bump in the road?  Or maybe you're the passenger and the driver brakes or accelerates unexpectedly?  More often than not, you may end up with water in your face.  And if anyone else in the car has seen Airplane!, odds are you might hear a snarky comment like "do you have a drinking problem?"

Splash Guards to the Rescue

While most major bottle manufacturers do not tend to sell splash guards within their own brands, a number of 3rd party companies have filled the gap (pun intended).  Not only are these great little products for limiting splashes, they can also be used as ice-stoppers.

​The problem is that some splash guards work better with certain bottles.  We're here to help clear up any confusion.

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Best Option for Hydro Flask

SplashPro

This may be a selfish way to start, but we here at BottlePro made this splash guard specifically to fit wide mouth Hydro Flasks.  We tried Guyot's design in our Hydro Flasks at first.  It's a great product, but we found that the honeycomb insulation in the Hydro Flask cap would push the splash guard too far down making it likely to drop into the bottle.  That's why we made SplashPro's design so it would fit around Hydro Flask caps.

Pros:

1. Works with wide mouth Hydro Flasks, and even fits around the insulation in the cap.
2. Includes two openings for low-flow and high-flow sipping, and the additional opening also limits "burping" by air pockets.
3. Also works with Iron Flasks, Thermoflasks, and Simple Modern bottles.

Cons:

1. Doesn't work with Nalgene bottles (too tight).
2. The insulated inside of Hydro Flask's standard wide mouth lids can sometimes push the SplashPro down with friction, but this is the best design for wide mouth Hydro Flasks.

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Best Option Specifically for Nalgenes

Nalgene Easy Sipper

This is one of the few bottle manufacturers that makes a branded splash guard for their bottles, so it's a great option for Nalgenes.

Pros:

1. Works specifically with Nalgenes.
2. Some customers report that they prefer the harder plastic of the Easy Sipper (compared to Guyot or HydraPak).
3. Less likely to fall into the bottle than Guyot or HydraPak.
4. Includes a grip-point for easier retrieval.

Cons:

1. Doesn't work well with Hydro Flask bottles.
2. Does not have a vent opening on the opposite side from the drinking spout.  Can lead to your bottle "burping".

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The Original

Guyot Designs

Guyot was the first splash guard for wide mouth bottles and its a great all-around option for Nalgenes and many wide mouth bottles.

Pros:

1. Works with Nalgenes, Fifty/Fifty, and Iron Flask bottles.  Has many color options (you might have to look for the other Guyot listings).​
2. Has many color options (you might have to look for the other Guyot listings).
3. Includes an air vent to limit "burping".
4. Includes a lip on the top for easier retrieval.

Cons:

1. Doesn't work well with Hydro Flask bottles because the insulation in the cap pushes the splash guard down.

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A Great Alternative

HydraPak's Watergate

HydraPak's Watergate splash guard has a very similar design to Guyot and functions essentially the same.
​
Pros:

1. Works with Nalgenes, Fifty/Fifty, and Iron Flask bottles.  Has many color options (you might have to look for the other Guyot listings).​
2. Includes an air vent to limit "burping".

Cons:

1. Doesn't work well with Hydro Flask bottles because the insulation in the cap pushes the splash guard down.

See the Latest Price on Amazon