To be honest, we have no idea. What we do know is that it is Emily’s. So it’s a girl’s garment bag. So we can say a female’s garment bag will fit into a GR2 no problem.
Edit: Megan “the Ice Queen” just shot this my way after reading the first edit of this FAQ page.
“It is a Briggs and Riley Travelware series Trifold Garment Bag. It is not sold separately, it comes with their carry-on luggage.”
Everyone get all that? Good? (Check out the video if you’re still curious). Thanks Megan.