Making a barleywine with a larger starter (2 qts instead of 1) and I always make an additional pint to keep in a jar. Looking at my flask I’m thinking it might fit but it also might spew through the airlock. I have an additional 2000ml flask, but...
5 quarts? Do you mean 3?
Guessing he meant 5 pints (2 quarts plus 1 pint to save).
Edit: if that’s the case then I don’t think it will fit (5 pints = 2.4 L)
5 quarts? Do you mean 3?