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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
Item # Y450
Shipping Eligible for Free Shipping Program
Availability California - In Stock
Pennsylvania - In Stock
Weight 2LBS
Community Q&A

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Browse 2 questions Browse 2 questions and 29 answers
Why did you choose this?
MoreFlavor Store
to make yeast starter
Garry W on Aug 28, 2018
Time to put on my big boy pants and make the right starters
karl h on Jul 11, 2018
to make yeast starter
Garry W on Aug 28, 2018
Need to make my yeast stronger!
Jon S on Jul 19, 2018
Time to put on my big boy pants and make the right starters
karl h on Jul 11, 2018
Over build yeast starters
Joshua T V on Jul 5, 2018
large yeast starter needed
Craig Isvak Managing M on May 28, 2018
Yeast starter for lagers.
Dennis Ellis on May 15, 2018
I want to make single, over-sized starters and save 1/2 for next time
Art Blackwood on May 15, 2018
I picked these items to present science experiments at schools across America. I am The Science Machine! Google me...
Michael G on May 7, 2018
big batch yeast starters
Kevin L M on Apr 12, 2018
To make larger starters
Joseph K on Apr 11, 2018
I already own a 2000mL flask and I need the larger size because I'm going to be doing larger yeast starters
James Prickett on Mar 31, 2018
needed large flask for starters
Stephen T on Mar 21, 2018
To make larger starters for 10 gal batches.
John Richardson on Mar 20, 2018
Brad M on Mar 16, 2018
it's a handy size for starters
Ed M on Mar 16, 2018
I will use this to make yeast starters for 10 gal. batches.
John B on Mar 16, 2018
I nee larger starters
Robert P on Mar 6, 2018
I needed a flask for larger starters.
Nick B on Mar 1, 2018
price, free shipping
Scott N on Mar 1, 2018
For yeast starters
Jason C on Feb 12, 2018
sold my 2,000 ml flask
CPT Krug, Jonathan, G on Feb 12, 2018
10 gallon lager and high gravity starters
Jason S on Jan 30, 2018
Have a looking to do very large starters so I thought this would be a good container to get
Matthew on Jan 29, 2018
to make starter for 10 gallon batches
Timothy M on Jan 10, 2018
Need to make my yeast stronger!
Jon S on Jul 19, 2018
Over build yeast starters
Joshua T V on Jul 5, 2018
What is the diameter of the bottom of this 5000 mL erlenmeyer flask?
Dennis Ellis on Jan 30, 2018

The flat part of the bottom is 6.5 inches in diameter. The widest dimension is 8.75 inches.

4.5 / 5.0
63 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Super quality!!
Excellent shipment, it arrived without a scratch, definitively the best size for my 1 bbl starters
August 29, 2018
1 month ago
Good 5L flask with a flat bottom.
Great 5L flask. This one has a very flat bottom so it still works with smaller stir plates such as the stir starter (what I have).
July 21, 2018
4 months ago
not sure what grade this is
my flasks came with scratches, bubbles and chips not sure I would put these on a flame and waste the yeast if it exploded. I will be sending these back. They don't even say that they're pyrex. No wonder they recommend the double boiler method these flasks are wonky at best
June 11, 2018
3 months ago
Works with my stir plate
No issues with my stir plate. Stir bar holds tight in center of this flask at all speeds even though the bottom is slightly concave. A high quality stir plate with strong magnets may over come the drawback of a concave bottom. The graduation markings are "approximate." This isn't an issue for me because I use measuring vessels that are more accurate as a work around. This flask is priced appropriately for what you get, which is why I purchased it. My equipment was able to overcome the slight flaws easily, which made this flask usable for me and a bargain.
June 8, 2018
3 months ago
Response from MoreFlavor
Great review!
June 12, 2018
Zach R Staff
Perfect for harvesting yeast
April 30, 2018
5 months ago
Love it for lager starters
April 16, 2018
5 months ago
Inaccurate volume markings
The two 5L flasks I received were not Bomex flasks and the volume markings are way off. We’re paying $40 for these and they’re not even graduated correctly!
April 16, 2018
Great quality. Got it at a great price! Love it!
April 12, 2018
8 months ago
Awesome Product
This thing makes large yeast starters so much easier than my old 2L flask. No more worrying about waking up to a mess. It's also great to boil directly on the stove and chill directly in the sink, less chance for contamination.

My current stir plate is struggling to keep up, although that's because it was made for 2L flasks.
March 19, 2018
6 months ago
I really like the size of this flask. It makes a very good starter for my wine making. Are use a stir plate when using this and everything went very well.
February 26, 2018
7 months ago