They sure are! We were even over the 75 lb limit on the way home because DW thought it was essential to bring home the extra dishwasher detergent. I quickly tossed the $2 worth of soap into the trash and saved us lots of money.
That weight limit burns me up though. We bought a big suitcase because it's so much more convenient to lug that around while toting DD4 and DS1 around. But now we'd be better off financially with 3 small suitcases.