Hey, sorry I'm late to the party, but here's Wally in her Birdie GoGo from last summer. It's the size small.
View attachment 271865
I'm 5'4" and it's proportional to me. The only complaint I have is that Wally can't see me, so she's pretty chirpy if she's on my back
I ordered directly from Celltei website and used their "new pet owner" discount. Also, although the website charges extra for certain colors, the owner didn't when I got an invoice directly from her instead of going through the website. ( In this case, I had been emailing her directly as to what fabric was immediately available as opposed to having wait to have it come in first)