After countless gallons of paint that have gone into our house (I don't even want to attempt to count!) we've discovered a great way to preserve a little bit for touch ups. Rather than climbing up in the attic every time we need a drop of paint to cover up a little knick in the wall, we started storing small amounts in mason jars. It keeps the paint fresh and is easy to access.
Since our cutie pie puppies like to occassionally chew on our pergola, we always have this handy jar ready at all times. By labeling the jars, it makes life so much easier!