Be careful of luggage size if it close to the top limit of the airlines. You probably will go over 50 lbs, if that is your weight limit. I have a suitcase that is under the size limit, but I have never been able to use it because of weight. I really do not want to travel with a suitcase that is not full. So I only the use the "medium" size suitcase. If it was totally packed, it still will go over 50 lbs. So weight should be more of a consideration than size.