I read on HBT that someone would save his yeast cake into three plastic bottles, and then use each bottle in a new batch. I didn't have three plastic bottles, used to hold pressure from the yeast as opposed to glass. And the guy at my LHBS told me the pressure in the plastic bottles would be bad for the yeast, and he just saves his yeast in a growler. Given I had many empty growlers, I just poured my yeast cake, with some fermented wort to swirl it up, into a growler and put it in the fridge.
My question, given the above "thirds" implication, can I reuse the yeast in my growler, and how much to use for my next batch.
The yeast was a wyeast 001