...another option with the foodsaver... I bought a large foodsaver canister (big enough to hold any jars you might want to re-use ) and have used it to seal dry things in with great success. It works well for old pasta sauce jars with the original lids, and all sort of other jars and lids you want to re-use (only for dry storage). You just put the jar with the lid on it in the canister and vacuum seal the canister. Then, after removing the hose, you release the pressure using the canister release button. The jar inside will magically seal with the lid button sucked down. I have the size for standard size mason jars, but not the wide mouth, so I use this method on widemouth mason jars as well as the other store jars.
I use old jars and lids for dehydrated foods, chocolate... anything dry I want to store longer on the shelf.
This does still require power, though, so I am looking forward to seeing your other method TBM.