I'd have expected a  œcarry cover  to be designed to allow you to actually transport ie. carry the pizza oven. This is definitely not that.
Hopefully somebody will come up with a better design, as this one's design is terrible on multiple levels.
The most obvious issue is that it assumes for some stupid reason that you'd leave the chimney attached. Why would you do that? With the chimney attached it won't fit into most cars, whereas with the chimney removed it will.
So while it sort of  œworks  it's not a well designed case at all and whoever designed it obviously never actually used it.