We would recommend keeping them stored in small plastic pots or jars with an airtight lid. Small glass pots or vials would be better, but they are more fragile and breakable, and not so easy to transport whilst traveling.
Rapés are very finely powdered snuffs, so they easily absorb moisture from the air. To keep them fresh and moisture-free, please ensure you keep them stored in an airtight container. Also, it’s best to keep them away from humid, damp and wet environments. And, best stored away from direct sunlight.