One of my favorite recent purchases was a few of these waterproof cases with the customizable inserts from BangGood . I picked up 2 for $8 each but unfortunately they've gone way up in price since. I have one that I've set up to store 4 SBC handhelds and the other I'm using with my Gameboy Horror (GBC) which comfortably holds the Gameboy Color console, a battery charger, 4 games in their cases, 4 extra AA batteries and a worm light. The case itself is semi cheap plastic but it gets a good airtight seal keeping moisture out. Hopefully I'll find some deals on similar cases. They are perfect for storage and still small enough to be used for on the go travel as well.