The current Kirkland bag is a polycarbonate bag made by Samsonite. My issue is with the size. It's almost exactly 62", packing dimension. It's a little over 64" when you count the wheels and handle. AA specifically includes the wheels and handles. AA charges $200 for an oversized bag. Makes no sense taking a chance. I spoke to the luggage buyer at COSTCO. She said the bag is the same size as previous bags, she's never had an issue using the bag and her contacts at the airlines told her wheels and handles aren't measured. She said they tell customers to check with their airline

*Please check with your airline for baggage restrictions and requirements.

I wouldn't try that with Spirit, not that I'd ever fly them. I'm not sure what I'd say if an AA clerk showed me the picture from their website while asking how I want to pay the $200 fee.

edited to add I copied this from the website description:

Total Overall Dimensions**:
31.5" L x 20.25" W x 12.5 H (Linear Dimension 64.25")


Other Kirkland bags are made by Ricardo, obviously to COSTCO's specifications.

I might give the $99 deal a shot. The bags are both the right size. COSTCO will take it back if the zipper is as bad as it appeared to the PP.