Storing discs on top of each other

I recently received The Best of Bogart Collection. There are 4 discs, and they come in a single case, with 2 discs on each half of the case. Each pair of discs is stacked together with nothing in between them, on the same post. I'm thinking this can't be a good idea for long-term storage.... is this really OK for the discs? I would have expected there to be an extra piece on a hinge as you usually see with multi-disc boxes.