I have one too, for my 680e, and I second John on this. But that snug fit is exactly the beauty of it. See this thread:
http://www.hpcfactor.com/forums/forums/thread-view.asp?tid=3229&posts=2
The Otterbox "Bargain Bin" is down for maintenance at the moment
(lot of that going around right now
), but check it later. I also got a small Otterbox that could hold NICs, memory cards, and other small things, but there'd be room left over, so I don't know if they'd slide around on the inside. But they'd be just as protected from water as the 720 in the bigger box.