My current seed bank is around 60 Ziploc freezer bags. In alphabetical order. I haven’t been as careful lately with storage conditions as at times in the past, these plastic bins with lids (there is third one with bigger bags of larger seed, like beans and peas) are kept out of sunlight and away from heat. I could do a lot more, but I’m not going for long term storage, and most of the time there seems to be no critical difference in germination time and rate for seed 1-2 years old, which is the longest I keep anything in any sort of quantity. Fresh seed may pop up a little quicker, but with the many other variables based mainly on the weather, it all seems to even out by the time harvest day rolls around!