Due to space constraints, I can;t keep all my open pipe tobacco in jars, so I have found a better solution that has worked for over a year now, so it's still a bit of an experiment, but I learned this from others.
You can buy Mylar Foil ziplock bags from multiple sources, including Amazon. These are basically the same type of bag that Ken Byron Tobacco comes in and they are available in multiple sizes. They are absolutely air tight because I keep all my pipe tobacco in my Wineador with my cigars and there is no hint of pipe tobacco smell. I just use one shelf and "file" them in an open tupperware container.
If you want to see pictures of how I'm storing them, let me know and I'll snap one when I get home.
My suggestion to you is to leave them in the tins, and pop the tin inside the mylar bag for double protection...
Also, if you plan to put them down for a long time, they can be heat sealed using a standard vacuum sealer machine. Then when opened, they still have the ziplock function.