I've been using the .6 quart Clickclack container for about 2 1/2 years now,
This review is from: Clickclack Stack and Seal .6-Quart Canister, Charcoal Lid (Kitchen)and it works great. I use it to keep my decaf in -- holds about half a pound of the ground beans.
The seal is tight and reliable and has held up well to almost daily use (decaf for after dinner most days). My coffee stays fresh and I don't have to worry about a mess in case the container gets knocked on the floor, again. I've been very pleased with this one and the larger one I store the regular coffee in.
This has proved to be a quality product, and I highly recommend it.