Hello,
I would advise you to visit local grocery story into food storage section to look for food containers. They are waterproof, good and solid plastic and the most important - you could get an idea and affordable experience on how big you actually need. I store a lot of "not only electronics" in them, as they being 'retired' from kitchen. Any brand is good, as far case has glued silicon strip in a cover and all-perimeter locks.
73 de OH2DZ
