I've been using the hot chocolate jars you get from co-op for years now. They're brown glass so you can put them anywhere and the weed inside is always in the dark and people can't see what's inside. If you screw the lid on tight they're airtight. I also know that 1 jar last me approx 2 to 3 weeks, so by looking at how many jars I have left I know at a glance how many weeks of smoking I have left before the next lot is ready.
Best of all they're free.....well once you've used the original contents they are