Erlenmeyer Flask (5000 mL)

Erlenmeyer Flask (5000 mL)

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The perfect container for rehydrating yeast or mixing up additions. Erlenmeyer flasks allow you to swirl your yeast or acid, tannins, nutrients, etc. into solution. The clear glass allows you to see when the solution is fully mixed.

In the lab world, these are known as "Student Grade"

Made from Borosilicate glass, it can be rapidly heated or cooled without the risk of cracking.


  • Massive 5L (5000ML) Capacity
  • Made from Borosilicate Glass
  • Fantastic price for a flask of this size

Kegland Part Number: KL04008

Item # Y450
Shipping Eligible for Free Shipping Program
Availability California - In Stock
Pennsylvania - In Stock
Weight 7 LBS
Community Q&A

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Browse 4 questions Browse 4 questions and 19 answers
Why did you choose this?
MoreFlavor Store
10+ gallon starters
Timothy S on Feb 16, 2023
Good pricing and want to improve fermentation by making yeast starter
Gerard D on Dec 13, 2022
10+ gallon starters
Timothy S on Feb 16, 2023
More head room for large yeast starters
Daniel Z on Jan 5, 2023
Good pricing and want to improve fermentation by making yeast starter
Gerard D on Dec 13, 2022
Bigger yeast starters
Eric M on Oct 11, 2022
need larger flask for starters
greg l on Sep 10, 2022
need a 2nd flask for 20 gal batches
Andy L on Aug 19, 2022
Need large flask for yeast
Ronald L W on Jul 28, 2022
making yeast starter
Old Sol E on Jul 20, 2022
Because a 3L doesn’t have enough head room for a 3L boil. Even with 3 drops of Fermcap-S.
Richard Radford on Jul 15, 2022
Need bigger he starters than 2000 mL
Jeff B on Jun 21, 2022
Large Yeast Starters
Jeremy S on Apr 15, 2022
Feel like this is large enough to do any batch
Pressley K on Mar 19, 2022
to make starter directly in flask and minimize boil over
Bryan S on Mar 17, 2022
Yeast starter
Richard S on Mar 2, 2022
volume & price
William Ogert on Feb 26, 2022
Best price
Mitchell F on Feb 8, 2022
Cause I wanted it.
Elliot J S on Feb 1, 2022
I wanted to make larger starters
nick r on Jan 26, 2022
Collecting bottle caps
Aaron H on Jan 22, 2022
good reviews
Mark S on Jan 11, 2022
Brad K on Nov 25, 2021
Yeast starters
Elias C on Nov 22, 2021
I need to make big starters!
Mark M on Nov 13, 2021
Recommended by a friend
Doug R on Nov 13, 2021
I'll be using this product for yeast starters
Eric E on Nov 6, 2021
great price on giant flask
Jeffery B on Oct 21, 2021
Because you offered the best price and free shipping.
NICHOLAS A. on Oct 16, 2021
Best price on the net.
Larry T on Oct 11, 2021
Halloween costume prop
Ryan G on Oct 11, 2021
great price
paul arthur s on Oct 8, 2021
Lager Starter
Joseph T on Sep 30, 2021
Planning to make yeast starter for 10 gallons or more at a time.
John Nolte on Sep 11, 2021
need an extra
Gianmarco L on Sep 11, 2021
High gravity starters
Erich F on Jul 20, 2021
Big enough for Lager yeast starters
Michael R S on Jun 25, 2021
Starters for 10 gal batches
Dallas E on Jun 25, 2021
make larger starters
colm g on Mar 30, 2021
More beer customer service
Kelly L on Mar 26, 2021
Beer deal
Matthew J on Mar 18, 2021
Deal of the day
kody g on Mar 15, 2021
To overbuild starters
Antonio Martinez on Mar 4, 2021
Wanted a larger flask
Stephen A on Feb 25, 2021
Need for large lager yeast starters
Karl G on Feb 15, 2021
Great price on the big one!
Brennan L on Feb 6, 2021
Big starters, baby!
matt s on Jan 14, 2021
To make starter for lager. 2000ml is too small!
Alexander Osborne on Jan 12, 2021
High capacity so I can make starters for any size beer I plan to brew.
Dylan H on Jan 11, 2021
Perfect for high ABV yeast starter
Robert W on Dec 30, 2020
It’s a gift for my son-in-law
Lynna S on Dec 11, 2020
Last starter ended up all over the place
Valued C on Dec 2, 2020
More head room for large yeast starters
Daniel Z on Jan 5, 2023
Bigger yeast starters
Eric M on Oct 11, 2022
What is the diameter of the bottom of this 5000 mL erlenmeyer flask?
Dennis Ellis on Jan 30, 2018
BEST ANSWER: There may be a touch of variation unit to unit - my numbers differ slightly from Dennis'. On mine the flat part of base is 5+7/8" around the raised flat lip. Widest part is 9". Height is 15".

The volumetric markings on mine are not as close as I would like (probably off by ~ 1/4L or so @3L), so I use a digital scale to measure the added liquid (1kg ~= 1L water at roomish temp).

I don't trust direct heating any flask, especially this big over direct flame, so I never do that - I'd love to hear from others who have success doing this. But I have never had any issues transferring hot liquids into this flask - no cracks, etc. But I have been careful. 5L is a lot of potential pain - better safe than sorry. Cheers!
What size (replacement) foam stopper does this need? 11 1/2? Where do I get this?
Thomas Garten on Feb 18, 2019
BEST ANSWER: Hi Thomas - The #12 foam stopper should work perfectly with the item. Unfortunately, we do not have a specific recommendation for the purchase but a quick google search should bring satisfactory results.
Is the bottom supposed to be flat or concave? I just bought one of these, and the bottom is concave (bows upward in the middle). As a result of this the stir bar falls to the side and stays there, and the stir plate can't spin it. I just spent 30 minutes trying to wiggle it to the middle to get it started, to no avail. What am I doing wrong? Seems to me that if the bottom was flat, this wouldn't be an issue.
James Galvin on Dec 11, 2020
BEST ANSWER: The bottom of Erlenmeyer flasks never seem to be completely flat as you would like. Using a stir bar inside one generally requires a stir plate with a fairly powerful magnet. Especially with large flasks such as a 5000 mL, I can't run the stir feature at anywhere near full speed. When the magnet jumps to the edge of the flask, I simply turn off the stir plate, tilt the flask so only a bottom edge is against the center of the stir plate (where its magnet is). While keeping contact, I slowly rotate the flask until I hear the magnet in the stir plate find the bar in the flask. While maintaining contact with the plate, I then slowly upright the flask and re-center it on the plate. I know the speed limit of my plate, so I can generally prevent this, but it's not a big deal when it happens if you know this trick. Hope it helps.
Using Double Boil Method:... "This process is much safer and efficient. If the flask should break ..." Why would the flask break from boiling if its pyrex?
Austin Woitte on Aug 13, 2019
BEST ANSWER: Well, in a perfect world with perfect quality, you could ignore this advice, if you could be sure you never damage the flask in an undetectable way.... these flask are not to lab quality standards, they are essentially seconds...more prone to failure I suspect.... that said I boil direct, using the same flask at least 30 times so far

4.6 / 5.0
89 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Rated 5 out of 5
Great for Large Starters
This is what you need for your larger starters. It works well and can have hot wort cooled directly in ice water.
April 22, 2022
over 2 years ago
Rated 5 out of 5
Excellent Quality best Price I've Seen Anywhere
This flask is so much better than my last one. It's made from thick Pyrex and this guy is HUGE! Perfect for extra large starters for 10 gallon lagers. This is a bit overkill for 5 gallon batches but it's perfect for when you need to grow a ton of yeast.
March 10, 2022
over 2 years ago
Rated 5 out of 5
Works well
Good addition to my flask collection, especially when doing larger starters.
January 19, 2022
over 2 years ago
Rated 5 out of 5
Very Happy
I'm extremely happy with this 5000 ml flask. It it is of a high quality and I have no fear of it breaking without the exception of my own clumsiness. It is huge, beautiful and I got it at a very fair price.
November 26, 2021
over 2 years ago
Rated 5 out of 5
Monster flask!
This is for those BIG yeast starters and it works great!
July 12, 2021
over 3 years ago
Rated 5 out of 5
Buy this one
I bought a 2000ml flask first, but wish I'd gone straight to the 5000. This one is big enough to make any starter you'll ever need and then some. In fact I've started doubling my starters so I can harvest half to keep yeast on hand for strains I use frequently. I boil directly in the flask on my glass top stove and transfer directly to an ice bath in the sink, no issues. If you do boil in the flask you'll need a few drops of fermcap-S to prevent boil overs
May 26, 2021
over 3 years ago
Rated 5 out of 5
Excellent product for excellent price...
February 19, 2021
over 3 years ago
Rated 5 out of 5
It works great I boiled in it I chilled in it there was no problem
The flask is genuine. I boiled and chilled in it no problems. The foam stopper fits perfectly!
The flask is genuine. I boiled and chilled in it no problems. The foam stopper fits perfectly!
January 8, 2021
over 3 years ago
Rated 5 out of 5
Excellent! And thank you to the customer service team for awesome service!!
September 30, 2020
over 3 years ago
Rated 4 out of 5
Bigger is better!
The size of this thing is mammoth. It is just what you need to for yeast starters for high alcohol brews. It would have gotten 5 stars but there are bubbles in the glass in certain areas, which means I have to boil the malt in a pot before transferring the hot liquid to the flask. I don't want it to shatter. Small inconvenience in my mind.
September 17, 2020
over 3 years ago