I have this Aquata tramp bag I use to store gear when distance racing:
http://www.catsailor.com/store/pc/viewPrd.asp?idproduct=16607&idcategory=0Its a big bag, very easy to get in an out of but has a flaw. The bag itself is made of a waterproof material, but the zipper is not waterproof. When sailing in big breeze, the zipper lets water in and then the bag holds it. Saltwater corrodes things like knives and batteries that I often only have in 1 layer of dry bag really really quickly, in a matter of hours. I know, double or triple up on dry bags but that isn't convenient. It would be much preferred if the outer bag itself was a dry bag or perhaps made of mesh so water didn't sit in it.
I'll probably modify this tramp bag with grommets on the bottom to let it drain, but I'm wondering if a better tramp bag exists? I.e, one that is all mesh or one that is complete dry, the later being my preference.