Thanks, letiole. I took Doc's advice and called United--I don't know why I didn't think of that first, but it seems I always turn to these boards first. Probably because of the great information.--Anyway, when I got the agent on the phone at UA, she told me 46 linear inches. I asked her to break that down. No matter what I said, she kept saying 46 linear inches. Finally, after asking to speak with her supervisor, she came up with 23x14x9, which is all I simply wanted to know. My bag comes in just barely under that size.