Any issues curing in giant 21/2 gallon air tight glass containers?
I think the weight of that volume would be a problem, mashing buds together. I use a 1-gallon jar[1] for walking it down from 70% to 65%, then hold it for 3 weeks there before moving to 1/2-gallon jars[2]. The size of the 1-gal jar makes it harder to "burp." I have to fan the lid over the opening to help move the air. At the higher range, I'll pour the buds out, let them air for 30 minutes. While holding at 65-62% for 3 weeks I lay the jar on its side and roll it every day or three. I notice when I don't do this, the buds get mashed together. I think a jar holding 2-1/2 times the volume would be too much weight on the bottom buds (even laying on its side), and harder to expose the bowels to fresh air when burping.
For longer-term curing (storage?) I size the jar to what I have. Anything from a pint to a half-gal. The half gals are hard to find locally. Ace Hardware seems to be the go-to place for these.
If you really want long-term storage, get a Foodsaver wide-mouth vacuum lid attachment and the Foodsaver accessory connector. You can attach it to a hand vacuum pump (used to bleed car brakes) if you don't want to buy a Foodsaver. There are instructions on the internet for converting tire pumps to vacuum pumps.
I use Boveda 62 for curing (and long-term jars that are not re-vacuumed after opening). I think it's handy especially if you overshoot the drying process a little (never a lot!). I keep a couple Boveda 65s for when that happens. Helps pull the buds back up higher/faster.
There are reports of Boveda packs bursting in vacuum. Using a Boveda and vacuum together seems like mixing goals anyway. Boveda should be for holding a frequently opened container at a stable RH. Vacuum seal for something you don't expect to open for 2 months or longer.
I like the
Western Humidor Caliber IV. It can be calibrated using a Boveda 62 in a mason jar.
[1] Ball mason jar (decorative) sold at Walmart and Target. A slip-on lid, not air-tight but not loose either. Any minor air exchange is beneficial in my dry climate to help walk the humidity down. If I think it should retain its moisture, I stretch plastic wrap across the mouth, and slip the lid on.
[2] Ball wide-mouth mason jar, air-tight, sold at Ace Hardware.