Store them in a clean plastic soap travel box. These are boxes are available at dollar stores (usually 3/$1.) as well as in the health and beauty sections of most big box stores, like Walmart and Target. It will hold 2 decks of cards at once.
If your kids are still small, soap boxes work great for crayons as well.
These soap boxes also make great containers for:
- Personal Size First Aid Kits (Hiking, Day Trips)
- Bead holders/Organizers
- Crayon boxes for younger kids (they'll hold 16 crayons)
- Q-Tips While Traveling