you can buy dry bags to keep your gear dry. I don't think i've ever seen a hard case dry bag (at least one that could be fit into a kayak)

But, if you wanted protection, you could buy a dry bag to put your cam in and then buy a plastic (tupperware) case that you can put the dry bag in.

http://www.dickssportinggoods.com/pr...ductId=3078645