Heh... 100 lbs? Packing light. I recall working inbound CP
flights from LHR
.... now those
are big friggin' suitcases! Four to five feet long, a foot and a half deep to two feet deep, and three or four feet high... with a million wheels on the bottom, and tied with a length of ugly yellow (or blue) nylon rope. And they weighed 150 lbs! Ah, the memories.....
But yeah... some LCCs do charge excess bag fees if you're carrying 20 pieces of luggage.... and they'll tell you that your excess bags might not make the flight, as they are a lower priority than someone else's single suitcase. I recall some charter carriers used to charge hefty overweight fees, but I haven't heard or seen that amongst LCCs up in my neck of the woods.... usually anything over 50 lbs is most often considered a "Heavy" bag.