Well, rats! I just ordered this 19.5x16x8 bag in blue on Saturday and it's due to arrive on Wednesday.
I've been an REI member since 1987. I wonder if I could get the $43 difference refunded to my CC or as store credit? Truth be told, being sure to get the blue color is worth the extra money to me.
I debated long and hard with myself about the 16" vs 14" width. I typically fly Delta and it's been impossible to get an answer by phone or chat about whether the 45" total is okay or if the 16" width won't fit in the overhead bins. I plan to take the bag to the Tucson airport and consult the Delta folks there about it.
I want to believe that the Delta 45" listing is for non-US travelers whose luggage may fit that requirement, but may not be the exact same dimensions as US standard carry-ons. If it works for them, why wouldn't it work for me?
That 16" carry-on width is common in Europe and for European airlines, including British Airways (22x18x10) and Aer Lingus (21.5x15.5x9.5), the 2 main options for my flight to Dublin and return from London next summer.
Below is a link to 2021 carry-on dimensions and weight limits for many airlines around the world. It gives the detail, but verification with the airlines' websites is always a good idea. https://upgradedpoints.com/travel/airlines/carry-on-luggage-size-chart/