This isn’t really new, nor is it my idea, but its something I learned from instructables.com.
This is called an “Alvin” vacuum sealer, and what it does is allow you to use you vacuum food saver attachments to seal mason jars and without needing electric power.
I like this mason jar vacuum sealer alot. It is something I use regularly. Especially, since I hate getting out the food-saver for a small amount of food.
I seal dried food in mason jars all the time.
This DIY Mason Jar Vacuum Sealer is quite useful to me. It is also something that is cheap and easy to build. I bet you will be happy you made one.
This only works with DRIED food, as no heat is involved. So if you try to use it to preserve jelly or any other wet pack product you are asking for botulism. Trust me, few things are worse than dieing from total paralysis from the botulism toxin. If your item is has more than 10% moisture do not use this method.