Originally Posted by
patgarrett
I recently picked up a Luggage Works 22" carry-on. Its total dimensions are 45" (the carry-on limit with most airlines) but I was still ordered to check it at LHR last week.

It was nowhere near fitting inside the carry-on frame used at security to check baggage sizes, so I'd probably recommend a 20" as you're less likely to be told to check it.
I was also nailed with this new sizer nonsense at LHR last week. Seems they have recently decided all bags which might potentially be "close" in size must get crammed in the sizer.
My 22" Tumi didn't fit until I emptied half of it on the floor, but it eventually crammed in....