Secure ice chest?

So CA DFG has explained when we can fillet fish and discard the carcasses back in the water:

http://www.norcalkayakanglers.com/bb/index.php?topic=6478.0

This means just keeping fillets on ice will do, especially in freshwater or when saltwater rock fishing, and a large fish bag is not always required.

Next question: is there a secure, meaning will not open when dumped upside down, ice chest? Or is there a better surefire cold storage method?

When I do the GAF trip to Tahoe we both have ice chests in the tank well of our kayaks. One for beer and the other for food.
They are relatively decent sized, but not huge by any stretch. I think I got them at Wally World for $15 each. They fit perfectly in the wells of our Prowlers. Mine is the 15, her's the 13.
We secure them with scuba tank straps. I got them off the internet from Malibu Kayaks http://www.malibukayaks.com/gear.asp
They have brass clips on the ends and an adjustable buckle in the middle.



I use 3 of them for my ice chest. One through the end of each handle to hold the chest in place should I capsize and one over the middle to make sure it doesn't come open if I capsize. It works very well. I had the yak tip once when I was being pulled by a waterski rope ( had to try it at least once ) and I didn't lose anything from the ice chest. I guarentee you will not paddle as fast as I was going when it happened so I know it works.
Since they are adjustable they are very versatile. Just clip the brass buckles to any eyelet and you are good to go.

I use a rubber maid ice chest that I have strings attached to for securing to the yak. Good for summer and beer.
 In the cooler months just a plastic tote that sits a little flatter than the cooler, put some ice or not.

Thanks, guys!

Going to set up an older OK Scupper Pro for meat fishing and want to keep the protein good to go.

On my next yak I'll be using a soft sided cooler.  Stowable for when not in use, separated compartment to keep the fillets out of the melted ice, zip shut won't open if you dump in the surf, cheaper than a fish bag an many sizes to choose from. 

There is also a system that amounts to an insulated bag with a zipper that you can put ice in and store stuff. This way you can get it into the hatch.