I bought some Boveda 62s a couple nights ago to use with my latest autoflower harvest (2nd autoflower grow). Much more stable RH in the jar than I had before. It sounds like you're saying they can be rehydrated. I plan to keep my packs in a mason jar when not used. I wonder if a damp sponge in the bottom of the jar would keep them "fresh" (hydrated) between uses. I imagine some type of "stand off" would be necessary to keep the packs from touching the sponge. (Can they be over saturated such that they won't absorb more?). I've read that we should be careful using them in vacuum-sealed jars. There have been reports of Bovedas bursting. Apparently there can be small amounts of air inside the Boveda pack. Enough negative pressure can pull the bubble through the membrane causing a leak. I read Boveda saying they're working on their sealing process to eliminate any trapped air. What I read was from 6 months ago. If someone wanted to vacuum seal, I suppose the pack could be slipped into an unsealed baggy. If it burst, the spill would be contained in the bag -- not pour out onto the bud? I assume the open-top bag would allow the Boveda to do its magic on the ambient air. I'll play with this sometime.