Thanks! I'm flying Southwest; these will qualify since the dimensions posted on the box falls under SWA's limits:
* Checked-in limit is 62" . This one 29.5+ 19.25+ 11.4 = 60.5"
* Carry-on limit is 24x16x10. This one is 23.5″ x 15.5″ x 10″
Looks like there's a $30 coupon 4/19 - 5/13/18.