Mumbles, I'm no expert but I like the "concept" of dry boxes but in reality, they have some disadvantages. If you have the coin and can afford the weight, they work great under a seat or as a bench seat. But getting custom boxes are spendy unless you can do it yourself. Plus, unlike a dry bag that can flex, dry boxes are rigid. Keep exploring ideas though, you may run into a winner that nobody has thought of yet.