At this point, almost everyone in those long airport security lines understand what to do — shoes off, laptop out, liquids minimal and ziplocked. However, because they vary from country to country, even frequent fliers have problems with baggage restrictions.
To understand the basics of bags, the U.S. Tour Operators Association outlines baggage allowances for checked and carry-on luggage in various parts of the world.
Most domestic and transatlantic flights in the US allow two pieces of checked luggage. They have to measure no more 62 linear inches — that is, height plus width plus depth. The maximum baggage weight for coach passengers is 50 pounds. However, if you change planes in Europe, for example, the maximum allowance is 44 pounds.
Rules and regulations for carry-on luggage also vary. Forty-five linear inches is the dimension limit, and maximum weight ranges from 40 to 50 pounds. In some places, a personal item, like a handbag or a laptop, or an additional carry-on are permitted. But for reasons of security, if you’re traveling to or from the UK, your carry-on allowance is a firm one bag.
In short, you may be as comfortable in an airport as in your livingroom, but when traveling abroad, it is important to double check all rules before you leave home.