I messed up when I first started to stock my prepping pantry. I just stored the salt on the shelf as is. Wow, within a few short months they were all rock hard. I live off-grid, so no temperature control or dehumidifiers. Lesson learned. Now I empty each container into a vac seal bag and use my food saver. I then place those bags in buckets. Seasonings and spices sure are worth their weight in gold to me and it's easy to prep and store them (once you know how, haha).