Senior Moderator; Moderator, Eco-Conscious Travel, United and Flyertalk Cares
Join Date: Jun 1999
Location: Fulltime travel/mostly Europe
Programs: UA 1.7 MM;; Accor & Marriott Pt; Hyatt Globalist
Posts: 17,831
Nanook:
I don't know the exact size of the opening, but I can tell you that United's carry on limits are 45 linear inches (9x14x22). My carry on is 9 1/2 inches deep and 14 inches wide and it fits inside the templates at SFO with just a fraction of an inch on each side to spare.