This flask is the perfect size and material with which to make a five gallon yeast starter. Convenient to use as the glass can go right on the open flame stove. Quality is excellent.

Excellent quality. Nice that you can boil directly in the flask

I have also used this to mix additional nutes and add them after fermentation has begun.

This vessel worked very well and the size was prefect for my Yeast Starter and Magnetic Spinner.

Works as expected. Good quality

Works as it should...

Simple device works as expected. Works great making starters for up to five gallon batches

Well it does hold what it says. I don't boil in them so can't say. It scares me to put on flaming stove top. Base may be too large for some stir plates. 2000ml base 4.75''- 5'' w

I have used this flask twice now to do a yeast starter for homebrewing beer. I have been able to use the flask directly on a stove top burner and directly cool in an ice bath. I also use a stir plate and it works great. There were some other comments that the curved bottom inside the flask prevented the stir bar from staying centered. I have not experienced that; the bar has remained in place and continued to create a nice vortex in the wort.

I've made a starter with this on a stir plate and it worked fine. Looks like it will be easy to clean with a bottle brush.

bought 2 - during a sale - good investment as I move into making starters

Perfect. Can boil in it no issue.

Perfect for starters on 5 gallon batches

Great product at a good price!

Great addition to my home brewery.

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.

this is great for making starters!

Sturdy construction for heating on stove. Only challenge is finding a bung/stopper to fit for airlock.

Love this flask it's very thick and well made. No issues heating to a boil directly on a gas stove.

Works as advertised great size for a large starter which is great for higher gravity beers. Shipping was quick and easy!

I've had no problems with this and its big enough for all but my biggest yeast starters.

High quality handles wide fluctuations in temp changes well which is what you really need from a starter flask.

When combined with a stir plate great for making starters for most strength beers. High gravity lagers need a bigger flask or to do two step starter

If I'm doing a 10gal batch I use two of these. Its definitely nice to be able to do starters in a single vessel and avoid additional opportunity for contamination by transferring to another vessel. Handles going straight from a boil on the stovetop directly into the freezer to cool down before pitching yeast.

I bought 2 after I broke the one I had for years. Works as designed and the best price I found for this size.

I've been using these for years & this one from More Beer does the job. Tempered glass helps it last a long time as long as I don't burn the bottom!

I was looking to start using a stir plate. This is what I needed! Good price and great shipping speed!

I bought this to make yeast starters. I works great. Just a heads up though if you fill it to the level you want before you boil the water there will be MUCH less. Also you it to create an airlock with my blowoff tube. The neck is wide enough to let air escape but the shape holds the tube well and with the wide base doesnt tip over

Really sturdy flask that I use for all my yeast starters. Just my little tip on starters I start to boil the DME/water mixture in a large pot so that when the hot break (yes you still get one with DME) happens it won't make a mess. After the hot break I pour the wort into this flask (using BE490 funnel) and top off with a little more boiling water. And then since it's borosilicate glass you can move it from the boil into a cold water bath for cooling.

I really didn't get my beers to turn out properly until I started making a yeast starter. This flask makes it easy. Proper size for a 5 gallon batch. and great quality for the price too.

This is my go-to flask for starters and it has always performed exactly how it is supposed to through about 15+ batches so far. One of the best priced value flasks available!

Not the greatest gradation marks but great value for the price.

I bought this flask after I accidentally broke another flask I had. This flask is much thicker and more sturdy than the other one I had. I'd only buy this flask if I need another one.