Useful links for shopping on the Internet
The International Air Transport Association is an international trade body made up of over 250 airlines. Their website provides information to airline passengers on variety of travel related subjects and is the authority on the rules governing cabin and checked luggage including maximum permitted sizes and weights.
A brief description of the various types of luggage that exists can be found on the luggage page on Wikipedia
The Henley Visa Restriction Index ranks countries according to their citizens freedom to travel.