I think you can have two bags up to 100 lbs. Usually whenever I go to ICN from JFK the desk workers in the Diamond line don't really care how much the bags weight. My mother and I always have our luggage at around 50 lbs each and since its two it's combined weight for 100 lbs and the workers never really looked at it or cared about it so I'm not sure how workers at places like LAX or ORD would handle it. But at JFK they barely even cared...