They are larger than the Disney ones (from my comparison of the safes at Pop and CR, I still found SOG's to be bigger).
There was more than enough room for us to put an ipod, jewelry box, wallets, ticket/pass holders and camera when we left the room (to go swimming, etc.)
If you line items up correctly, you could probably fit a laptop or a portable DVD player in the safe (we didn't have one to try), but the safe was plenty big enough for our needs.