[header] How to pack for a trip to london [title] Read over your airline's luggage restrictions. [step] If you travelling by airline, go to the company's website and look for their baggage guidelines. You will see how many bags they will allow you to take and the exact required dimensions of each bag. 
Pay particular attention to the size of overhead bags and the weight limitations on checked bags. [substeps] Of course, if you exceed the guidelines most airlines will let you take your bag along for an additional fee.