storing paint with baby food jars

Here's a pro tip that was passed on to me years ago: if you have a young child or have friends/family who do, save those baby food jars. They are excellent for storing premixed paint because of their air lock lids and convenient size. I've got a bunch of jars my sister donated to me when she gave birth to my niece and nephew. The blue in the jar I'm holding was mixed 7 months ago - and it's still active!