don't actually need one
K, bless him, has alerted me to a valuable company and its product line.
You know, we are taking him on the plane to MA for Thanksgiving. However, he's not crawling yet, and may not ever crawl -- he might be too big to start. Furthermore, he could bust out of that carrier with two well-placed kicks to begin with. And then you have one pissed-off Mongo on your hands, something I doubt the FAA had anticipated.