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 5 questions Browse 5 questions and 69 answers
Why did you choose this?
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Big starters, baby!
matt s on Jan 14, 2021
High capacity so I can make starters for any size beer I plan to brew.
Dylan H on Jan 11, 2021
Big starters, baby!
matt s on Jan 14, 2021
To make starter for lager. 2000ml is too small!
Alexander O 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
Kyle r on Dec 2, 2020
Sean S on Nov 30, 2020
I need a bigger flask.
kevin s on Nov 28, 2020
Rick Carruth on Nov 28, 2020
For starting yeast
Harold N on Nov 19, 2020
need back up
Michael W on Nov 6, 2020
For lager starter
Jason R on Oct 29, 2020
Excellent price
Michael on Sep 30, 2020
Good reviews and best price
Brant B on Sep 23, 2020
Yeast starter for 10+ gallon batches
Curtis B on Sep 22, 2020
Gianmarco L on Sep 3, 2020
Need something bigger than my 2L for 10 gal batches
Michael A on Aug 27, 2020
it was a gift request
Lisa T on Aug 18, 2020
For making starters for my 15 gallon batches
Valued C on Aug 4, 2020
Need a bigger flask for high gravity starters
SCOTT S. on Jul 16, 2020
right size, right price
Ken M on Jul 8, 2020
LAGER starter
Pete T on Jul 3, 2020
to save on yeast cost
Michael Dean on Jul 3, 2020
I like big flasks...
Philip B on Jun 16, 2020
yeast starters
Daniel W on Jun 12, 2020
For brewing beer
Heather B on Jun 10, 2020
Yeast starters for 40 liters of lager
David Carpenter on Jun 5, 2020
for making larger starers
Will S on May 23, 2020
If you make 2L starters, you're gonna boil over with anything smaller. Just buy it and you'll be happy.
Adam L on Apr 19, 2020
Make massive starters
Allen S on Mar 26, 2020
good price
Marco a L on Feb 25, 2020
Yeast cultures for 3bbl brews
Douglas B on Feb 22, 2020
big starters
Charles W on Feb 20, 2020
Ryan A on Feb 6, 2020
Upgrading starter equipment
Mark A on Feb 4, 2020
Fairest price around by far!
Dwain R W on Jan 29, 2020
Jorge V on Jan 23, 2020
Want to make yeast starters
Jim B on Jan 14, 2020
Online recommendations
Jaime L on Dec 5, 2019
large yeast starters
Brandon Whitehead on Dec 2, 2019
Need a larger flask for 10 Gallon batches and lagers
Nelson L on Dec 2, 2019
Steven C on Nov 30, 2019
Great price
Steve K on Nov 30, 2019
Yeast starter for 10 gallon batches
derek barrington on Nov 25, 2019
Mike on Nov 18, 2019
Recommended by a friend
David S on Oct 24, 2019
high gravity lager starters
Andrew L on Oct 15, 2019
Good price
Clayton B on Sep 9, 2019
Big yeast starter
Walter M on Aug 31, 2019
Yeast starters
Patrick B M on Aug 28, 2019
To make starter for lager. 2000ml is too small!
Alexander O on Jan 12, 2021
Perfect for high ABV yeast starter
Robert W on Dec 30, 2020
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!
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
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.

4.6 / 5.0
82 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
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
3 weeks ago
Rated 5 out of 5
Excellent! And thank you to the customer service team for awesome service!!
September 30, 2020
4 months 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
4 months ago
Rated 4 out of 5
Big Beer Needs Big Starter
This is the Mac Daddy Flask. Big beer plans need a big starter. A gallon on the stir plate makes it happen. Discounted 1 star for the graduation marks at 4 & 5 liters being off by quite a bit.
September 8, 2020
over 3 years ago
Rated 3 out of 5
Good flask with bad volume markings
For the price, this is an excellent 5-liter flask, just the thing for huge yeast starters. Be warned, though, that the volume graduations are not accurate, at least not on my model. The 2,000 mL mark is spot on, but others are not. I wouldn't discourage potential buyers from getting one of these if you just need a big, affordable vessel to contain a starter, but know that you can't trust the graduations on the side. Use a scale and you'll be fine, though.
June 26, 2020
7 months ago
Rated 5 out of 5
Great Product
I mean, it works great. When you want the flexibility to make starters of any size, just get a 5L.
April 29, 2020
9 months ago
Rated 5 out of 5
Very useful and arrived as promised
December 23, 2019
1 year ago
Rated 5 out of 5
Good value
Works as intended. Building up a starter right now. Great for 10 gallon batches
December 17, 2019
1 year ago
Rated 5 out of 5
A good purchase
This arrived as advertised. A really big Erlenmeyer flask that seems to be very solid and well made, with uniformly thick walls and base. No scratches or defects found. Holds up to heating. And it came at a very good price for this size and quality of lab glassware.
November 7, 2019
1 year ago
Rated 5 out of 5
Just what I needed
Great for starters! Now I don’t have to be concerned with my yeast starters bubbling over and making a mess. Cooked right on the stove and then direct to cool water and ice with the borosilicate. Still works with my little stir plate as well.
April 30, 2019
1 year ago