For a natural look, just scoop it into a clear or colored jar and put the lid on. Done!
Note, I'm just using a simple mason jar here to hold the salts. I've seen bath salts packaged in everything from small plastic bags, to paper sacks, to test tubes, to lovely plastic bottles, to seasonal coffee cups and more. Anything that will hold the salt, keep it sealed from the air, and not react to the fragrance or essential oil is great.
Try out some different bath salts recipes and/or create your own!