I use 1/2 gal. plastic containers with snap on lids. I've kept and reused for 5 months, but I use some of it to make a new starter.
(brewing yeast cultures are lot tougher than we think).
some are. after googling a fair bit, ive decided im not going to be using WLP023 as i had planned, as multiple separate people complained that it basically died on them due to having a production date just a few months old. they all couldnt effectively get it to make a starter doing normal processes.
there are variations between the different yeast in terms of vigour and other factors that arent well detailed yet.
i would love to have suggested O2 requirement categories for yeast or even simply just a note like "this one needs heavy oxygenation".
as well as varied best-before dates.