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 4 questions Browse 4 questions and 54 answers
Why did you choose this?
MoreFlavor Store
Size and price.
SAMUEL A G on Oct 13, 2021
To do yeast starters for 5 gal batches
Matthew E on Jul 16, 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 E 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 M on Nov 30, 2020
To make yeast starter
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 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
Speece C on Dec 2, 2019
Mark S on Dec 2, 2019
Upgrading my brewing game!
Herminio A on Dec 1, 2019
Steve S on Dec 1, 2019
yeast starter
Joseph A on Nov 30, 2019
To do 1500ml yeast starters
Dennis S on Nov 25, 2019
want to make larger starter and harvest half before pitching
George M on Aug 28, 2019
Need to use for first lager attempt
Duane on Jul 1, 2019
Deal of the day!
Philip Mistretta on Jun 26, 2019
For yeast starters.
Kyle Heon on Jun 21, 2019
I wanted it. For larger starters.
Gene L on Jun 10, 2019
Need a 2nd flask
James W on Mar 23, 2019
need two liter for propper starter
Gary G on Mar 12, 2019
It goes with the stir plate
Sheryl W on Feb 16, 2019
They work great
Bruce P on Feb 15, 2019
Because i want to up my game when it comes to yeast starters
Matthew F on Dec 5, 2018
Harvest yeast
Anthony M on Oct 6, 2018
I want to make yeast starters. The Erlenmeyer flask lets me boil and pitch with a single vessel.
Robert Freiderich on Aug 18, 2018
Quality is important to me
Charles R on Sep 13, 2021
My Yeast wanted a room with a view.
Jeff M on Jul 8, 2021
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 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
63 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
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
7 months 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
7 months ago
Rated 5 out of 5
Works as expected. Good quality
February 27, 2021
8 months ago
Rated 5 out of 5
Works as it should...
January 26, 2021
10 months 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 2 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
1 year 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
1 year 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
1 year ago
Rated 5 out of 5
perfect for starters
bought 2 - during a sale - good investment as I move into making starters
January 1, 2019
over 2 years ago
Rated 5 out of 5
Perfect. Can boil in it, no issue.
August 7, 2018
over 3 years ago