Why less is more when it comes to luggage - detailed information on checked bags and carry

Dear Participants of the 2011 JSerra Catholic High School Italy Performance Tour,
please remember that when traveling in such a large group and on a coach full of fellow travelers, luggage space is limited. As explained during the presentations, we recommend that you bring only what is really necessary, namely 1 checked bag per person.
Here are the checked bag dimensions for Swiss and the weight limit for that one checked suitcase is 44 pounds. Swiss: the permitted size, which is the total of the height, width and length, may not exceed 62.2 inches (158 cm)
In addition, due to limited space on the bus, Incantato Tours allows one small carry-on, ideally a backpack, plus a personal item (small purse, camera bag, laptop bag). Carry-on weight limit from the airlines is 17 pounds (8 kilos) which we advise not to max out again as space on the bus is very limited. Your carry-on items may not be accommodated in the luggage compartment of the coaches, but have to be fit into the overhead compartments on the bus, the seat in front of the travelers or people's laps. We thank you for your understanding and compliance with the above instructions for tour luggage. With such a large group traveling together, we advise again to keep both checked and carry-on luggage to an absolute minimum as that will make everyone's journey easier.