I think you mean a CO might not cover??? The box they ship in is 15" (tall) x 12" x 12". My UFO is 14" at the widest point (11" where the spacer fits) and the CO has ~ 1 1/2" overhang, so it's on the smallish side . For $20 with free shipping it might be worth the risk.
Dan Brewer
AKA Gime2much