I have two 1-liter flasks that I barely use anymore. For example, I'm brewing a OG 1.064 beer this weekend and I needed a 1.62 liter starter for this.
Now I make most of my yeast starters in 1-gallon glass growler. A generic growler is much cheaper than flasks!
The only time I use smaller than 1-gallon containers is if I'm harvesting yeast and I need to start very small then step it up a few times until I have the amount/volume I need.
Here's one: 1-gallon growler
The growler costs $4.50, a 2L flask costs $21.99.
Of course you'll still have to pay for shipping but if you combine it with other beer making supplies it's worth it.
You can't boil water in the growler like you can with a flask but I prefer to make my starters using a regular pot on the stove anyways. I then cool the wort in an ice-bath in the sink before transferring it to the growler.
These glass jugs give you a lot more headspace also... this helps prevent overflows caused from strong fermentations/krausen.
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