Some of you that own a Model S might have purchased a Dreamcase for it. And now maybe you are thinking about buying a Model Y and are wondering if that old Dreamcase would work. I just tested that out, and the answer is - sort of. The mattress itself fits really well, but the support for the part of the mattress that hangs over the gap behind the front seats is not tall enough to reach the mattress. I'm going to find way to make it work, and will post some pictures once I figure that out.