cvaults are just expensive metal jars with humidipaks. I like the humidipak for storing my personal smoke but I prefer glass jars. I've been doing it that way for years ever since I discovered the humidipaks, the lowest rh% they used to make them in at the time was 69% (except i think there's 1 for guitars that's way too low like 45% or something) cuz I guess nobody wants anything less than that for cigar storage.... personally that made my meds just a little too moist for my taste but it was still dry enough to smoke and not grow mold, and it was a lot better than being crumbly dry like meds tend to get here in AZ. these days they also offer the 62% which is PERFECT for meds, I love them! still better off just throwing them in a glass jar though, imo.
http://www.amazon.com/Boveda-Micro-Humidipak-62-Pack/dp/B007V8K9TQ/ref=pd_sim_k_2 they also have different sizes depending on what size jar you will use it for
and I agree with 1337hacker, probably best not use them for drying/curing but definitely works well for storage. I have thought about experimenting with using them during the drying process though..
edit - and 62% is actually perfect for drying, i think about 60-65% rh and 65-70 degrees F are what's traditionally recommended for optimal drying conditions iirc (of course you can still do just fine in other conditions like we have to here in the az climate). the problem in drying with humidipaks would be that you still need to allow for gas exchange, and the fact that moisture does not get absorbed by the humidipak as fast as it evaporates from the wet buds, so a sealed jar with a 62% humidipak and drying buds will actually stay at a higher rh% until it's had enough time for the moisture content to stablize at 62% within the buds and the air in the jar