I have mine in an open cardboard box, on the floor. The boys have recently discovered how to climb in it and steal sticks. There are now sticks all over my house. I buy about 3-4 pounds of sticks at a time and have never had any go moldy on me.
I keep mine in one of those plastic stackable bins. I just punched some holes in the drawers for airflow, even though they are not exactly airtight in the first place, lol.