I hermetically seal mine in Tupperware cake server with fifteen silica desiccant packets
I used a dummy head wearing a Nixon mask for a while... photo somewhere...
I hermetically seal mine in a big ziplock, but I might browse the tupperware section next. I used to use a plaster dummy head of myself, made by an aunt when I was 5, but the beatlesque mop-top hair style stretched things out too much, sort of like the Nixon political enemies list.. nice mental image of him critically listening to those 18 minutes on your cans.
A friend has a nice semi-rigid, zippered fabric case- sort of like a giant sunglasses case that I'd love to find.