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)

California Recipients: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Item # Y430
Shipping Eligible for Free Shipping Program
Availability California - In Stock
Pennsylvania - In Stock
Weight 1LBS
Community Q&A

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Browse 1 question Browse 1 question and 1 answer
Why did you choose this?
MoreFlavor Store
want to make larger starter and harvest half before pitching
George M on Aug 28, 2019
Deal of the day!
Philip Mistretta on Jun 26, 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.
Refactored 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
Yeast starters
Brent Bott on Jun 26, 2018
I wanted a second one
Peter M on Jun 26, 2018
Yeast starters
Antonio Martinez on May 30, 2018
Jeff P on Apr 10, 2018
To make better starters
James G. W on Mar 23, 2018
Recommended by fellow brewing friend.
Tom S on Mar 20, 2018
For yeast starter
MARK R on Mar 6, 2018
Yeast starters
Brian J S on Feb 19, 2018
Need to use for first lager attempt
Duane on Jul 1, 2019
For yeast starters.
Refactored on Jun 21, 2019
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.

4.4 / 5.0
55 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
perfect for starters
bought 2 - during a sale - good investment as I move into making starters
January 1, 2019
10 months ago
Perfect. Can boil in it, no issue.
August 7, 2018
1 year ago
2L Flask
Perfect for starters on 5 gallon batches
May 13, 2018
1 year ago
Great Product
Great product at a good price!
April 16, 2018
1 year ago
Great addition to my home brewery.
April 13, 2018
1 year ago
Nicer than expected.
Well made. Nice smooth bottom as to not throw stir bar. Works well with water, now to throw a starter in it and see how it does.
April 4, 2018
1 year ago
this is great for making starters!
April 3, 2018
1 year ago
fair price for good product
Sturdy construction for heating on stove. Only challenge is finding a bung/stopper to fit for airlock.
March 27, 2018
1 year ago
Bottom not flat
I'm guessing that at least 50% of home brewers use a stir plate when making starters. These flasks are unsuitable for that purpose because their bottoms are not flat. They are curved and cause the magnetic capsule to throw to the edges of the flask. In all other respects they are sturdy and useful, but if you have a stir plate, you will be very disappointed.
January 3, 2017
Quality Product
Love this flask, it's very thick and well made. No issues heating to a boil directly on a gas stove.
May 31, 2015