Luggage
So, you are in heaven dreaming about your vacation. But it does not give you the right to dream while you are packing your things. Usually, it is better to purchase the suitcase of bright color (red or yellow, for example), because it allows you to distinguish your luggage on the check line among other suitcases. Wheeled ones are advertised to be comfortable, but take into consideration that you are going to walk uneven streets, perhaps. However, these suitcases are comfortable only on the even roads.
When you go though security, make sure that you do not have any metal items in your pockets.
Check your carry-on beforehand. The matter is that you are not allowed to bring some items like scissors, knives, fireworks, flammable liquids, chemicals, guns, firearms. In order to escape the troubles with them when you are checked, put them out beforehand. You are allowed to take some items with you. You can include the irreplaceable things (jewelries and medicines), money, documents, some change. If you can pay for extra-weight, do it, just in case.
If it is possible, lock your suitcases before giving it to the luggage store. Of course, it is doubtful that somebody would like to open locked suitcases.
If you do not trust the airlines or any other mean, use the carry-on only. And be joyful about your journey!