This is indicated on the right hand side of your ticket. Economy class passengers generally are allowed 20 kg, except British Airways who permit 23KG. Travelling to the USA Business Class is around 30-35 kg. First is up to 40 kg. Hand luggage remains pretty much generic: one piece per passenger, restricted in size (esp. short haul flights), and up to 8kg in weight. For larger items such a s windsurfers etc. you should check with the tour operator or airline with whom you have booked. Some additional charges may occur.
That amount of baggage, generally consisting of the passenger's personal effects, carried by the airline and cruise line free of charge.
The maximum number of bags that you are allowed. Midwest airlines permits a maximum of three checked bags and no carry-on bag, or two checked bags and a maximum of one carry-on.
The amount of baggage, generally consisting of the passenger's personal effects, permitted by the cruise line free of charge. The allowance is very generous (and if you reach it, you're packing way too much!) Of much more concern to you should be the baggage allowance that applies to your airline travel to and from the cruise.
Weight or pieces of baggage that may be carried by a passenger with no extra charge.
Amount of baggage a passenger may transport without having to pay extra charges. This allowance is determined by each air carrier.
The amount of baggage a passenger may carry on his flight without having to pay extra charges. This allowance differs with different air carriers.
Each airline has a maximum number of bags that you are allowed. Usually this is some combination of checked and carry-on items. It is wise to check with your airline before arriving at the airport to ensure that you will not incur any extra baggage costs.