Don't forget those folks who have the monthly burden of taking meds (think the elderly). Those prescription jars come in a wide variety of sizes. Waterproof? No, but you could use that silicone tape as a sealant. Free? Yup.

I like the "peanut butter jar" solution/outlook.

My $.02
_________________________
"Its not a matter of being ready as it is being prepared" -- B. E. J. Taylor