I got these at REI for $0.40 and they work very well:

1/4 oz container

Snap top, waterproof, and wider than tall (I have fat hands and have a hard time getting stuff out of something like a film canister). If this is not big enough, they also carry a 1 ounce and a 2 ounce size.

I'm in the process of making myself a fishing kit for backpacking using these.