YAHEY TSA approved locks.

This two pack of locks come individually packaged.  You can keep one and share one.  When I travel, I don't do it lightly.  I have two checked bags and a carry on.  I always pack extra locks incase I lose one or the airlines do.  This set comes with a 4 combo lock instead of 3.  That makes them harder for someone else to figure out the code.  I also use one of these on my pool deck lock.  That way I don't have to keep a key on my to get into the pool.  Security is very important when you have little ones around.  This is a nice set and I really like mine.