I should have looked for something like this earlier!!!
I have rental units where I provide a twin bed to the renter. Sometimes the renter comes in with their own mattress. In those cases my mattress goes into storage. I would put tarps over them, wrap them in industrial saran wrap, anything to keep them clean. Anyway, this bag is way easier to use and RE-USE. The 3 mil polyethylene material truly does resists rips and tears, and allows you to not worry to much about moisture of the dust of an actively used garage. Definitely worth it!