I'm so glad you mentioned the runDisney bibs. I should have mentioned that the sleeves fit *most* race bibs, but not all. I have a few in my bibfolio which had to be folded to fit. Nearly all of them fit except those races with over-sized bibs. The runDisney ones have never been attempted to be placed inside, but looks like they would need to be folded as well. I didn't take any measurements but I'm guessing you can find those online somewhere, otherwise ask and I'll be happy to help.
Here's a photo of the Marathon bib over the sleeves and as you can see it's just a touch too tall. If I wanted it to fit, I'd fold over the bottom part with my name and it would be no problem.
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Both of these bibs below are from 2014 and I don't know if the bibs have changed at all but wanted to provide a reference of some bibs that do fit just fine.
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Finally, it does look really nice on my running shelf so I wouldn't discourage you from buying one if you're looking for a way to better organize them. It looks much better than my previous method of storing them which was really just crumpled pieces of paper lying all over the house.
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