Well - be careful here. You dont want to use ordinary plastic box's as these can hold a electrical charge. Circuit boards and other electronic components are shipped in those smoky electrostatic-resistant bags just for this reason. And memory - is more sensitive to a static charge than other devices.
They do sell memory cases with anti-static plastic sleeves for memory cards:
http://www.amazon.com/Memory-Card-Ca...0823504&sr=8-2