I found this Car Jonn (“baby’s own traveling toilet trainer”) at a junk shop a while back (no it had never been used!) and I think someone out there needs to reissue some version of this, that isn’t entirely made out of plastic. This is mostly a very hardy coated cardboard, with some plastic for the perimeter and the lid. Apparently a Brooklyn company got the patent for this in 1960, and it expired in 1987. So somebody out there, here’s an idea just ripe for the taking. Let us know if you want the prototype!