Erlenmeyer Flask - 2000 mL

Erlenmeyer Flask - 2000 mL

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These Erlenmeyer flasks help the best brewers to make large yeast starters to get their beer fermenting fast. Large populations of active yeast help ensure a healthy fermentation, free of off flavors.  One of our favorite things about the Erlenmeyer flasks is that you can boil your starters directly in them!

Our large 2000ml Erlenmyer Flask is the ideal vessel to make a large yeast starter for 5 gallon lagers and high gravity brews. Because it is made from borosilicate glass you can move it from a boil on your gas stove into a cold water bath for cooling, without the risk of cracking. (We do not recommend the use of an electric element. If this cannot be avoided, we recommend using a larger pot as a hot water bath on the stove.) This means you can do the whole process in one container, keeping it simple and helping to reduce the risk of contamination when transferring from one container to another.

Recommended Process for Use of Flask:
Double Boiler Method

It is important for your safety to heat water in the flask with a heat source that distributes heat evenly. Our manufacturer has confirmed that direct heat to the glass can break down its integrity and break if the heat source doesn't distribute evenly.

Morebeer! recommends using the "double boiler method."  This process involves using a boiling water bath on the outside of the flask to heat up the water inside the flask.  All you need is a kettle 3 gallons or larger.  This process is much safer and efficient. If the flask should break or boil over, your kettle will be there to collect the contents, thus keeping your stove clean and keeping you away from potential harm.  


  • Massive 2L (2000mL) Capacity
  • Made from Borosilicate Glass
  • Fantastic price for a flask of this size
  • Produced for MoreBeer!
  • 6.5" base 2.5" top 10.75"H

Why make a yeast starter? (from our FAQ)
We build starters for 3 main reasons. First, to ensure yeast health. By making a starter 1-3 days in advance, you ensure that your yeast is healthy and strong and ready to do its job. Second, to create more yeast. By making the starter you will increase the cell count of the yeast, giving you a better chance of keeping bacteria's and wild yeasts from fermenting your wort. Third, if you are making high gravity beers. If you are making a high gravity beer (1.060+) you will need more yeast to start the ferment faster. High gravity beers will also finish more completely when you pitch ample quantities of yeast.

In the lab world, these flasks are known as "Student Grade". A great flask for making yeast starters!(Student grade is not the highest grade flasks and will have minor defects)

Kegland Part Number: KL03988

Item # Y430
Shipping Eligible for Free Shipping Program
Availability California - In Stock
Pennsylvania - In Stock
Weight 1 LBS
Community Q&A

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Browse 3 questions Browse 3 questions and 4 answers
Why did you choose this?
MoreFlavor Store
Yeast starter
George Seidensticker on Jan 30, 2023
Need a flask for starters. 1L seemed too small so I sized up to the 2L.
Tim Rumbolz on Oct 27, 2022
Yeast starter
George Seidensticker on Jan 30, 2023
I need this for my yeast production
Rick J on Jan 5, 2023
Need a flask for starters. 1L seemed too small so I sized up to the 2L.
Tim Rumbolz on Oct 27, 2022
wanted larger flask for bigger starter
Christopher T on Aug 31, 2022
got great reviews for a yeast starter
Jason on Jul 23, 2022
These are great for starting yeast with propper
Curtis T on Jul 1, 2022
I want to start doing starters for a cleaner fermentation
Wesley A D on Jun 27, 2022
it is a gift for my husband, he needs a new one
Janet M on Jun 26, 2022
Being a yeast scientist is scary...
Brady G on Apr 27, 2022
My 1L flask isn't big enough.
Justin K on Apr 12, 2022
replace broken one
Michael H on Apr 11, 2022
Ideal for making starters using liquid yeast
Edward V on Mar 9, 2022
Lisa R on Feb 22, 2022
Need to prepare yeast. Good price.
Eric E on Jan 22, 2022
Birthday gift
Michael P on Oct 20, 2021
A 2nd one is good to have as backup
William Brennan on Oct 20, 2021
Size and price.
SAMUEL A G on Oct 13, 2021
Quality is important to me
Charles R on Sep 13, 2021
To do yeast starters for 5 gal batches
Matthew Evans on Jul 16, 2021
My Yeast wanted a room with a view.
Jeff M on Jul 8, 2021
Yeast starter
Christian F on Apr 8, 2021
Current flask is a bit too small
Jason Kropp on Jan 29, 2021
I need a flat bottom flash so my stir bar stays in place when starting yeast
ian michael r on Jan 29, 2021
build yeast starter
Tim W on Jan 26, 2021
Michael J G on Jan 6, 2021
Yeast Starters
Ian F on Dec 21, 2020
Xmas gift
GUY JOSEPH P G on Dec 21, 2020
For yeast starter
Kenneth D on Dec 7, 2020
My 1L is not quiet large enough
Craig G on Dec 1, 2020
New to brewing and it’s required for yeast starters
George Moore on Nov 30, 2020
To make yeast starter
michael t on Nov 28, 2020
need back up
Michael W on Nov 6, 2020
Oh I knocked off my last one onto concrete...
Kenneth S on Sep 29, 2020
Geri E on Jul 30, 2020
yeast starter
David San C on Jul 28, 2020
To make larger batches of starter.
Derek E. W on Jul 22, 2020
fair price and wanted to try for home brewery
prof p on Jun 6, 2020
Yeast starter.
Stephen M on Jun 3, 2020
I broke my last one
Noel Johnston on May 22, 2020
need smaller flask
Mark A on May 19, 2020
Yeast Starter batches for 5 gallon brew systems
Jeff D on May 15, 2020
Size matters. I am currently using a 5000ml flask and it is more than I need.
geremy S on May 15, 2020
To make yeast starters
Brandon S on Apr 23, 2020
Don't have one and looks like a decent one- Newbie
Dennis F on Mar 19, 2020
Good price
Dwain R W on Jan 29, 2020
Recommended size for Stir Plate
Dale Z on Jan 16, 2020
Jared J on Dec 3, 2019
For yeast starters
Jake M on Dec 2, 2019
great price
Christopher S on Dec 2, 2019
Mark S on Dec 2, 2019
I need this for my yeast production
Rick J on Jan 5, 2023
wanted larger flask for bigger starter
Christopher T on Aug 31, 2022
Why does this carry a prop 65 warning for lead?
Jonathon Evans on Dec 7, 2019
BEST ANSWER: Hi Jonathon, from our understanding glass can potentially have a certain percentage of lead due to the content of recycled glass and different feed stocks.
Has anyone figured out a way to boil wort in this on an electric stove? Description recommends using a boiling water bath, but you will never get the flask to boil vigorously just by putting it into boiling water. Maybe a hot oil bath, but that would be a frightful mess to clean up.
Roy Westerberg on Dec 28, 2019
BEST ANSWER: I have no issues using a water bath with these flasks. The liquid inside gets plenty beyond the temperature needed to sterilize.
What size bung for a 2000ml flask?
Vincent Lenihan on Feb 12, 2019
BEST ANSWER: Hi Vincent - #9 or #10 stoppers will fit the 2000mL flask.

4.5 / 5.0
65 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Rated 5 out of 5
Perfect Tool
This flask is the perfect size and material with which to make a five gallon yeast starter. Convenient to use as the glass can go right on the open flame stove. Quality is excellent.
March 22, 2022
over 2 years ago
Rated 5 out of 5
Excellent quality. Nice that you can boil directly in the flask
February 5, 2022
over 2 years ago
Rated 5 out of 5
Perfect size for making a starter
I have also used this to mix additional nutes and add them after fermentation has begun.
April 15, 2021
over 3 years ago
Rated 5 out of 5
2000 ml Flask
This vessel worked very well and the size was prefect for my Yeast Starter and Magnetic Spinner.
March 18, 2021
over 3 years ago
Rated 5 out of 5
Works as expected. Good quality
February 27, 2021
over 3 years ago
Rated 5 out of 5
Works as it should...
January 26, 2021
over 3 years ago
Rated 5 out of 5
Simple device works as expected. Works great making starters for up to five gallon batches
User submitted image
Added Jul 28, 2020
July 28, 2020
over 5 years ago
Rated 5 out of 5
Flask for yeast starters
Well it does hold what it says. I don't boil in them so can't say. It scares me to put on flaming stove top. Base may be too large for some stir plates. 2000ml base 4.75''- 5'' w
July 18, 2020
over 4 years ago
Rated 5 out of 5
Erlenmeyer flask works great
I have used this flask twice now to do a yeast starter for homebrewing beer. I have been able to use the flask directly on a stove top burner and directly cool in an ice bath. I also use a stir plate and it works great. There were some other comments that the curved bottom inside the flask prevented the stir bar from staying centered. I have not experienced that; the bar has remained in place and continued to create a nice vortex in the wort.
May 6, 2020
over 4 years ago
Rated 5 out of 5
Works as expected.
I've made a starter with this, on a stir plate, and it worked fine. Looks like it will be easy to clean with a bottle brush.
January 13, 2020
over 4 years ago