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Alcoholic Drinks
How to Fill a Flask Download Article Reviewed by Nathan Taylor
Last Updated: June 5, 2025
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Filling with a Funnel
|
Pouring with a Measuring Cup
|
Expert Interview
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Warnings
|Show more|Show less X
This article was reviewed by Nathan Taylor. Nathan Taylor is a Mixologist and Owner of Cocktails Done Right based in Houston, TX. With over 25 years of experience, Nathan is passionate about providing first-class service and drinks, and training newer bartenders. Cocktails Done Right provides professional bartending services for special events, weddings, corporate events, and more. Their motto is “We mix the drinks, you mix the people”. His specialty is Vegas-style bartending with mind-blowing tricks and drinks. Nathan has 3 World Titles in Flair Bartending competitions, including one First Place Gold Shaker that he received while representing the US in Warsaw, Poland. He went to the Bartending School in 1993 and now works as an instructor at the Bartending and Mixology Academy. He is also a member of the United States Bartenders Guild. This article has been viewed 61,382 times.
Flasks are a time-tested and stylish method of carrying your favorite liquor in a pocket, bag, or even a boot to enjoy on-the-go. When it’s time to fill your flask with liquor, there are methods to use so that you don't spill and waste any of that precious bottle of rare whiskey that you’ve been saving for a special occasion.
Steps
Method 1 Method 1 of 2:
Filling with a Funnel
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1 Choose a funnel that fits in your flask. Many flasks come with small metal funnels that fit in the flasks. These are the best funnels with which to fill your flask as they are designed perfectly for the job and are nice and portable as well![1]X Expert Source Nathan TaylorMixologistExpert Interview [2]XResearch source
If you’ve lost the funnel that came with your flask you may be able to find a replacement one in a liquor store or online.
Alternatively you can use a small kitchen funnel, just make sure that the spout will fit nicely in the neck of your flask.
2 Place the funnel in the opening of the flask. Once you have chosen an appropriately-sized funnel, open the lid of your flask and place the spout of the funnel inside.[3]XResearch source
Make sure to place the flask on a flat and stable surface!
If you are using a funnel that did not come with the flask you may need to hold it in place to keep it steady.
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3 Open your preferred bottle of liquor. Get ready to fill your flask by opening up that prized bottle you’ve been saving for the occasion.
4 Fill the flask from your bottle. Slowly pour your chosen liquor into the flask. Keep an eye on the level of the liquor to be sure that it does not overflow the funnel.
It is a good idea to stop pouring periodically to look at the level of the liquor in the flask.
Once the liquid rises to the neck of the flask and spout of the funnel, stop pouring, remove the funnel, and close the flask.
Advertisement Method 2 Method 2 of 2:
Pouring with a Measuring Cup
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1 Check the bottom of your flask to determine the capacity. Flasks come in many different sizes, but most flasks will have their volume in ounces engraved on the bottom of the flask. [4]XResearch source
If you don’t see the capacity on the bottom, your flask may have it written somewhere else, so take a quick look all over your flask just to be sure.
If your flask does not display the capacity, you can fill it first with water, and then pour it out into a measuring cup to determine how much liquid it holds.
2 Fill a measuring cup to the correct capacity. Once you know the volume of your flask, open your chosen bottle of liquor and fill a measuring cup with the amount that the flask will hold. [5]XResearch source
You may want to fill the measuring cup just slightly under the capacity of the flask to avoid filling the flask right to the brim.
3 Set your flask on a stable surface. This method especially requires a lot of stability and control during pouring so a hard, flat surface such as a table or kitchen counter will work best.[6]XResearch source
4 Pour the contents of the measuring cup into the flask. Slowly pour out the liquor from the measuring cup into the flask.[7]XResearch source
It will take a bit of patience and control to avoid pouring too fast and splashing over the sides of the mouth of the flask.
Remember to stop pouring periodically to check on the level of liquor in the flask.
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Warnings
Remember to drink responsibly and that you should never drink and drive. Thanks Helpful 0 Not Helpful 0
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Expert Interview
Thanks for reading our article! If you’d like to learn more about bartending and cocktails, check out our in-depth interview with Nathan Taylor.
Reviewed by: Nathan Taylor Mixologist This article was reviewed by Nathan Taylor. Nathan Taylor is a Mixologist and Owner of Cocktails Done Right based in Houston, TX. With over 25 years of experience, Nathan is passionate about providing first-class service and drinks, and training newer bartenders. Cocktails Done Right provides professional bartending services for special events, weddings, corporate events, and more. Their motto is “We mix the drinks, you mix the people”. His specialty is Vegas-style bartending with mind-blowing tricks and drinks. Nathan has 3 World Titles in Flair Bartending competitions, including one First Place Gold Shaker that he received while representing the US in Warsaw, Poland. He went to the Bartending School in 1993 and now works as an instructor at the Bartending and Mixology Academy. He is also a member of the United States Bartenders Guild. This article has been viewed 61,382 times. 1 votes - 100% Co-authors: 9Updated: June 5, 2025 Views: 61,382 Categories: Alcoholic Drinks
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Yes No Advertisement Cookies make wikiHow better. By continuing to use our site, you agree to our cookie policy. Reviewed by: Nathan Taylor Mixologist Co-authors: 9Updated: June 5, 2025 Views: 61,382100% of readers found this article helpful. 1 votes - 100% Click a star to add your vote
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Reviewed by: Nathan Taylor Mixologist This article was reviewed by Nathan Taylor. Nathan Taylor is a Mixologist and Owner of Cocktails Done Right based in Houston, TX. With over 25 years of experience, Nathan is passionate about providing first-class service and drinks, and training newer bartenders. Cocktails Done Right provides professional bartending services for special events, weddings, corporate events, and more. Their motto is “We mix the drinks, you mix the people”. His specialty is Vegas-style bartending with mind-blowing tricks and drinks. Nathan has 3 World Titles in Flair Bartending competitions, including one First Place Gold Shaker that he received while representing the US in Warsaw, Poland. He went to the Bartending School in 1993 and now works as an instructor at the Bartending and Mixology Academy. He is also a member of the United States Bartenders Guild. This article has been viewed 61,382 times. 1 votes - 100% Co-authors: 9 Updated: June 5, 2025 Views: 61,382 Categories: Alcoholic Drinks 
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1 Choose a funnel that fits in your flask. Many flasks come with small metal funnels that fit in the flasks. These are the best funnels with which to fill your flask as they are designed perfectly for the job and are nice and portable as well![1] [2] 
2 Place the funnel in the opening of the flask. Once you have chosen an appropriately-sized funnel, open the lid of your flask and place the spout of the funnel inside.[3] 
1 Check the bottom of your flask to determine the capacity. Flasks come in many different sizes, but most flasks will have their volume in ounces engraved on the bottom of the flask. [4] 
3 Set your flask on a stable surface. This method especially requires a lot of stability and control during pouring so a hard, flat surface such as a table or kitchen counter will work best.[6] 
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