If you are going to be traveling for some years to come it will be advantageous for you to purchase luggage that meet as many of the airliners’ standards and restrictions as possible. This will enable you to use the same bags for all of your trips no matter which airline you end up flying with for all those travels. It is worthwhile to take a little bit of extra time to determine the size limits for the 5 to 10 companies you are most likely to fly with and then buy bags that fit in with those criteria – especially if you are a budget traveler or free travel vagabond. Keeping the bags relatively small will also make it easier for you to respect the weight limit for luggage and avoid extra charges.