You're better off going bigger. I'd recommend a 5 liter. You can still make a 1 liter starter in a 5 liter flask, you cannot make a 3 liter starter in a 1 or 2 liter flask. If you EVER might consider making a lager, or a big beer, or a 10 gallon batch, you'd be safe with the 5 liter. They really...