I had to store all my sewing room into a storage unit for 4 years, supposedly an A/C unit but I doubt it was. When the movers came to unload at the new house I found my Viking D1 box at the bottom of the pile with lots of heavy plastic totes filled with hardback books on it. I screamed but they told me they knew how to stack. I was in doubt but when I unpacked my machine it was just fine. Of course I had kept the styrofoam that had come into the box too and I guess its much more sturdy than I'd thought. I always keep my machine boxes for my machines. Oh yes, my machine was 10 years old so the box was not new either.