Keep every desiccant pack that falls out of every package and drop them in your ammo cans.
I understand that many piano's (and musical organ) stores have larger desiccant packages for international transport (to protect wood from warping).
Same thing with shoe stores - but with smaller packets of desiccant.
Many desiccant package contents change color if exposed to moisture
but can be microwaved, and thus re-charged for further duty.