Without adding extra padding or layers in this case, there is lots of extra room and play inside. There is an internal elastic band on one side and a mesh or webbing half pocket on another section. Neither of them hold the 2.5" Sabrent case securely. I have that Case bought with the floppy drive case and both were Sabrent branded and I assumed it would be "built for this" or better fit but it isn't. This case needed to be downsized primarily in terms of "thickness" it's too big for a 2.5 inch case.
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