Safe storage of any kind is not to good.
Quote:
humidity controlling silica
The problem with this is those eventually fill and are no longer any good. I've done that in a gun case and forgot to check and they eventually filled and spilled all over the bottom of the place. Worse than if not used at all. If you use those you have to remember to change them a lot. And remember the air you have in that case will stay there until you reopen the thing. You should really find a place in your house for any valuables.