http://www.airlinedelay.com/eu-passenger-rights/

We all have to take an air flight at least once in our lives that means we have to deal with decoding the mysteries of hand luggage. There is the question of how many bags are allowed and how big can these bags, and maybe I can sneak a smaller bag on the plane with me?
In light of the recent attacks on airplanes in the years past and the increasing pressure on airlines to be more sure many are going through a series of guidelines changing rapidly in many topics, including luggage. So despite the guidelines listed here its always best to check with your company air to see what kind of baggage will be allowed.
Usually airlines allow passengers to 40 pounds of luggage room, but you have to get the luggage to fit into a space that is somewhere between 14 inches high, 21 inches wide and only to 8 inches deep per bag. You may be allowed to take three pieces of luggage, which means getting to a package of just over 13 pounds in each bag. This can seem like much, but clothing and other items tend to increase travel to a lot very quickly.
You may have managed to sneak an extra bag on the plane with you in the past, but in the current climate would not suggest trying that. You are more likely to get caught by the attendants are trained to maintain a keen eye for unusual things. Also, if you get caught there is a possibility that could result in no fly list, depending on how you feel about safety at the airport. At least you will be charged a fee for that extra piece of baggage is necessary to revise and add more weight to the aircraft.
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Travelling in Europe: you have rights as an air passenger