I just use my foodsaver with the mason jar attachment and 99% of them seal indefinitely. I keep the jar out of the light. The jar I am currently using does get some light WHILE I am using it, but by the time that would be a factor, the weed has already deteriorated into smoke.mason jars are not air tight for the most part. i can't get most of mine to keep the vacuum seal, especially the small ones. i keep my jars in a drawer. it's dark in there. the brown glass mason jars are super expensive.