Well, given that you can now purchase disposable "diapers" for dogs, this doesn't surprise me.
There have been reuseable products for both dogs and cats on the market for many years, both to deal with marking and inappropriate urinating.
They are often known as "stud pants" because un-neutered male cats,especially those used for breeding, can spray urine in the house.
That said. I'll still stick with carrying a baggie for my dog. It's just easier and doesn't involve strapping the dog into some sort of contraption.