Flambeau makes a good waterproof bow that's actually waterproof. I own two with the slit foam friction fit for nymph boxes. I am almost positive they have one that fits your discription with the compatments on one side and the friction fit foam on the other. While I do find them to be a little heavier weight box than most I've had mine fly off the back of a car at 30-40mph and open and did'nt loose a bug or have damage to the case. Not one of the"Elite" brands but these are a good product.
http://fishing.flambeauoutdoors.com/....asp#swingleaf