I also ammo can it. Although I do have a bandoleer full of strippers at the ready for me to make the worst military fashion statement ever.
It goes anywhere I claim as residence for more than half the day...depending on your environment, you might want to go with new ammo cans vs. surplus, the seals can be a tad sketchy on those sometimes. I live in a rather dry environment, so conditions are optimal for me. I also live in a very gun rich environment...so a safe has never been high on my priority list.
Honestly, I have never even considered a safe for ammo at all. But my daughter is also very gun saavy, so I don't concern myself with child safety issues....most folk are scared to visit anyway.
If you eat jerky, save the packs and toss them in the ammo cans for a recycled source of silica gel.
I like the filing cabinet idea, but most new ones are far too chinsey for the weight...you would need an old school real steel one.