I bought a very cheap (but nice looking) copy of the Morgan case on ebay (from a private seller) and used a silicone waterproofer on it. I then fitted a gasket to the lid using self adhesive 10mm neoprene. The contents are kept in a waterproof bag (just in case).
It remained watertight during a very heavy downpour from western Scotland (aquaplaning volume) to the lake district and i would happily trust the case to remain dry inside again. Rain does darken the leather, but it does return to its original colour when dry,
I cannot see the point in having a good looking case then putting it in a waterproof bag. I would not ever leave the car unattended though even with a wired padlock.
