I use the hydrapeaks with the inserts and just bought the 2000ml 304 Stainless Steel Vacuum Insulation Lunch Box off Aliexpress that have 132/144 vial inserts. I've noticed a bit of frost buildup inside and on vials and did a bit of digging with ChatGPT:
At least, in my case, don't bring the boxes out of the freezer to open them. You let it fill with room temperature air and then you're sticking it back in the freezer to condensate.
Open the container or box while still in the freezer, don't even expose it to warm air if possibl
I have a bunch of the smaller versions of these. It's easier for me to play tetras in my freezer when I can move them around versus a few large ones. Also, I kinda love when I get a new one and get to pop out the little foam cutouts.