I quit using cardboard to hold my fabrics…I know it doesn’t seem like a lot, but once I removed them all, I had nearly half more room to store fabrics. Also, when I removed the fabrics, some sort of “coloring” seemed to have gotten on the first piece. I read that cardboard can absorb moisture and either the fabric will bleed a bit or the cardboard will. I don’t think it is of concern if you are storing for a short period or if you use commercial boards.