Aldi currently have twin packs of dessicant (silica gel or similar) on sale for less than $5 a twin pack.
I always keep any little (or big) sachet's i come across & throw them in the bottom of the safe, but for less than $5, i grabbed these.
Packs are a bit bulky, but if they dont fit in the safe can just do away with the pack & wrap them in a hanky or something....or get the missus to sew em up in part of an old pillow case.
Im not saying its the best humidity protectiin, but its better than nothing in the safe if you live in an area where humidity levels can rise at certain times of the year...

