This is the right answer. I've had them tell me my soft sided was too large and then I crammed it down inside the little box they have there to measure by and they let me go. Other gate workers don't even check. I started going in the same gate every game last year and always talk to the workers when I walk up and they recognized me and don't even look any more. As long at its close and you choose the right gate no problems.
On a slightly related matter, you can't take a knife w/ a blade larger than 4" into Davis Wade and you walk through metal detectors. Almost every baseball game last year I carried a large butcher knife that we cut steaks, sausage, tenderloins, etc with and they saw it every game and never said a word other than "bring me some meat" (which I occasionally do) and that buys favor when the cooler is a little larger than permitted.