If you are using for weed storage, just place weed in put on lid and screw down. Open 15 minutes three times daily to let "air", if you are curing. Must let out air daily or weed will get wet again and mold.

If you are using for canning, disregard above
LolaGal Reviewed by LolaGal on . how to use mason jars? so I finally got a mason jar When using them, do I have to vacuum seal them or can I just put the cap on and twist on the lid? Thanks Rating: 5