Vets use a nifty item for restraining cats. It is a ripstop nylon "sack", that zips up the cat's back and has strategically placed zippered openings. This allows exams and treatments and prevents the cat from lacerating the vet. I need one of these but do not know what it is called. I have been searching vet supply catalogs but, without a name for this item, it is proving difficult to find. Can anyone help?