Erlenmeyer Flask - 1000 mL

Erlenmeyer Flask - 1000 mL

In Stock
Delivers to ( change ) by as part of our Fast & Free Shipping.
Faster Shipping Available. Details.
60 day no hassle return policy. Details

The best brewers make large yeast starters to get their beer fermenting fast. Large populations of active yeast help ensure flavorful beer free of off flavors.

Our 1000ml Erlenmyer Flask is the ideal vessel to make a large yeast starter for 5 gallon batches. 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.  


  • 1L (1000mL) Capacity
  • Made from Borosilicate Glass
  • Fantastic price for a flask of this size
  • Produced for MoreBeer!

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.

Fits our stopper 8 (FE455)

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: KL03971

Item # Y420
Shipping Eligible for Free Shipping Program
Availability California - In Stock
Pennsylvania - Out Of Stock
Weight 0.50 LBS
Community Q&A

Start typing your question and we'll check if it was already asked and answered. Learn More
No questions have been asked about this item. Be the first!
Why did you choose this?
MoreFlavor Store
new equipment
James F on Jan 30, 2023
great for yeast starters
Joshua Huber on Nov 8, 2022
new equipment
James F on Jan 30, 2023
Jump start fermentation
Jerry G on Dec 9, 2022
great for yeast starters
Joshua Huber on Nov 8, 2022
replace broken item
Andy M on Sep 26, 2022
Tristan S on Jul 13, 2022
Starter for days
Steven J on May 24, 2022
yeast starter
Clifford T S on Jun 22, 2021
To make small yeast starter
MIKE W on Jun 2, 2021
It was the deal of the day, and I'm giving it as a gift.
Adrien Monteleone on Feb 10, 2021
Yeast Starter
dicgleason on Feb 2, 2021
Mark C on Jan 30, 2021
Making yeast starters is much easier with this tool.
Edward V on Jan 16, 2021
Going to use a yeast starter for my next batch
Joshua P on Jan 12, 2021
to use for yeast starter
Charles O on Jan 1, 2021
to rehydrate yeast
Robert on Nov 17, 2020
Yeast starters
David San C on Jul 28, 2020
Need this to make starters from harvested yeast.
Julian L on Jul 8, 2020
I have one and love it. Wanted a second one so that I can more easily do two starters which means two brews in one brew day.
Gabe C on Jun 4, 2020
brewers make wort, yeast make beer
Brett F on May 23, 2020
Need for cultivating yeast.
Kimberly on Apr 21, 2020
I figured I would get one for making lagers.
DAVID HARBIN on Feb 3, 2020
Krista H on Jan 29, 2020
Yeast starters
Kelly S on Jan 16, 2020
yeast starters
Peter on Mar 26, 2019
Low price
Alan A on Mar 5, 2019
recommended by your Reagent Bottle description
Mark R on Feb 3, 2019
will use for yeast starter
Arno C on Jan 26, 2019
Jump start fermentation
Jerry G on Dec 9, 2022
replace broken item
Andy M on Sep 26, 2022

4.6 / 5.0
9 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Rated 5 out of 5
Works great for rehydrating yeast.
January 17, 2022
1 year ago
Rated 3 out of 5
Too small
Too small for a 5 gal batch starter.
June 3, 2021
over 2 years ago
Rated 5 out of 5
If you find making yeast starters necessary, than this tool makes that task a whole lot easier. Right size for the 5-10 gallon batch size. Combo this flask with a stir plate and you be styl’n!
February 6, 2021
over 2 years ago
Rated 5 out of 5
Great for the yeast starter.
User submitted image
Added Apr 26, 2020
April 26, 2020
over 3 years ago
Rated 5 out of 5
Great flask
True to the Erlenmeyer name. Cooks over flame without cracking and holds yeast well with in airlock on top (airlock not included)
May 22, 2019
over 4 years ago
Rated 3 out of 5
Too small for a 5gal batch
For 5gal batches, I recommend going with the 2000ml version instead, which is large enough to reasonably handle a 1500-1600ml volume starter, and still minimize boilovers on the stove top so long as you watch it closely near boil time and are quick to reduce the heat at the transition point.
May 5, 2015
Rated 5 out of 5
Great for Small yeast starters
This flask is great for small yeast starters. Also if you have it shipped Morebeer packages it so well, there is no chance of it breaking.
Rated 5 out of 5
Excellent for use in making yeast starters.
I have been brewing for a few years when I decided to move up to increasing the effectiveness of my yeast. The 1000ml flask is great for this. It insures enough yeast for a robust fermentation.
May 28, 2013
Rated 5 out of 5
Good Product
This product is great because you can fill it with boiling liquid, and place it in an ice bath (as long as the ice bath water surface line does not go over the surface line of the liquid in the flask). One piece of advice for anybody who plans on advancing their brewing skills- get the 2000ml flask. For a lot of beers the size of the starter required with exceed 1000ml. I've had to make more concentrated starters as a result. I don't know how people who purchase the 500ml do anything. You can always just do successive starters, but just be easier on yourself and go for the 2000ml.
May 16, 2013