How many pieces of luggage can we take, what weight, what dimensions?
On most airlines, the suitcase in the hold should not exceed 158cm (height+width+depth) and 23kg.
More details depending on the airlines used:
The TSA type padlock is absolutely not mandatory for the United States. It is simply a universal padlock that US customs officials can open without any damage. If you don’t have this type of lock, don’t use a padlock as this will avoid the risk of damage to your suitcase in the event of an inspection.