I just sent out two different T30 samples for testing from different suppliers. Will store at -20C in a thermos (from my original post) in a manual defrost freezer. If I pull out a vial in November-2025 and send it for testing it would be at least one reasonably valid datapoint. Assuming there is consistency from vials in the same batch (or in my case kit).
If it's about the best insulated jar or bottle for keeping cold in, then wonder why many people go for those hydropeak jars instead of say Stanley classics, zojirushi, Thermos, etc which are generally better.
Got my Zojirushi thermos in. Threw in my yolink thermometer to test things out and it stopped temperature swings completely. I'll make a 3d printed vial holder for it over the weekend and share it here once it's done. Will spray it with shellac to prevent small plastic pieces from leaching onto the vials. It should be able to hold at least 30-40 vials stacked.
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