my lab does not have Mr Frosty. I freeze cells at -20 then -80, but wondering if anyone could developed a container similar to mr frosty using ethanol?
Try to thaw a vial (from those you froze with your method) and check cells viability with Trypan blue. If they are still alive (>95%), then try to plate them and see if they will still grow as before freezing. If they are growing OK, you probably should not need freezing containers.