What a pretty way to use recycled jars! This is a great way to keep the hair stuff visible and accessible. I would recommend using jars with as wide a mouth as you can find for easy retrieval of bits and pieces.
When finished with an empty cardboard salt container, cut the whole round top piece off and measure to fit a canning jar ring. Trace and cut with the flat part with scissors to fit a pint canning jar. Fill the jar with sugar, then cut a second one from a second empty salt container for non-dairy coffee creamer, spices, or flour. The pour spouts make for easy access to your sugar and creamer.
*If desired, half pint jars can be used instead of pint jars.