I have been noticing lately that there are many passengers with several hand-carry bags. One time we were in the last batch that embarked the plane and we ran out of luggage space on the overhead compartment. We had to place our hand-carry under our seat. When I asked the flight attendant why so, she answered that some passengers are saving money from checking in their luggage and they just split their things in 2 or 3 small bags. From all I know, only 1 hand-carry bag is allowed in the plane but it seems that it it not so anymore.