Mylar is pretty rigid. I use 4 mil mylar sleeves for all my autographs and artifacts. They are pretty stiff--definitely don't allow the paper inside to bend.
As you say, I have not seen mylar thick enough to make ball cubes--perhaps it would be too expensive.
I store my baseballs in acid-free cardboard boxes, with mylar lids. (As does the HoF.)
Last edited by David Atkatz; 09-17-2022 at 12:31 PM.
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