I recently had some older Boveda packs that I wanted to experiment with, so using a method I saw around here (can't remember where). I weighed the pack and subtracted the weight from 60 g to get the amount of water that had been lost. Then I added the pack to a airtight container along with the amount of water needed to bring it back up to 60 g. After a day or two the pack reabsorbed all the moisture, leaving a plump, squishy pack.

The only down side to this was that some of the water initially "leached" out what the packs had absorbed, which was a brown tannin-filled solution. The other thing I noted was the packs smelled very sour when wet, which must be from whatever else they absorbed while in the humidor (possibly ammonia from second/third fermentation).

Has anyone else noticed this before? If so, did you have any problems using the packs again? I often just let them passively recharge, but when I do it in a large batch it can take several weeks.