Google "lock and lock" containers. They are waterproof, airtight and come in a variety of sizes. I use them for food and other items. Some groceries carry them.
Amazon.com carries them:
http://www.amazon.com/Airtight-Food-Stor...297&sr=8-16Here's the manufacturer:
http://www.heritagemint.com/jump.jsp?itemType=CATEGORY&itemID=52&path=1%2C2%2C7%2C52&gclid=CO3MwbvnqZYCFQVfFQodPgX7xw