Thanks for all the input. I think I found what I'll go with. At a comping store, I found a hard plastic, credit-card sized waterproof container with a hinged lid, on a lanyard. The case is clear plastic (that is the first time I had seen this type of container in clear). It looks like the perfect size to fit passes, FastPasses and room key, and if it bothers me hanging around my neck, it is small and sturdy enough for my waistpack or pocket.