C&C Alternatives fleece in pet store cages?

It's possible to use fleece in store bought cages, but it's more work. You would need to be sweeping constantly, and the cage would start to smell sooner than with a large cage. It would require more cleanings, and therefore more laundry.

I use fleece in my "pet store cage" and it's fine. I do clean it out everyday or every other day though.

It will smell very quickly. Forgive me if I missed some history/context on your situation (if you mean for a quarantine cage) but if you plan on using it as a full time cage pet store cages really are not large enough!