i have filled a few condiment cups with sliced potato, the condiment cups were sterile enough for agar previously. however, if i could skip the whole process of making agar and sterilizing it, it would be kind of cool to be able to directly buy that from the store. so filling them was kind of a challenge, but if you use maybe slightly larger condiment cups you would be able to fit a whole slice. for now i just halved a few slices from the can and put them in cups. theoretically the canning process leaves them already sterile, so just dropping them into a sterile environment should allow a mostly contaminant free petri dish with very little work. time will tell i suppose! i'll post pictures if it works. i will inoculate them later tonight