How to Vacuum Seal Mason Jars
Place a canning lid on a filled jar, set the jar-sealer attachment over it, and run the vacuum until the air is pulled out and the lid seals down. Use it for dry goods; it is not canning and does not make low-acid foods shelf-stable.
A jar-sealer attachment turns any mason jar into a reusable vacuum container, no bags, no waste, and you can see what is inside. It is one of the handiest ways to keep dry pantry goods fresh.
Step by step
- Fill a clean, dry mason jar, leaving some headspace.
- Add a canning lid (flat lid) on the rim.
- Fit the jar-sealer attachment (wide or regular mouth) over the lid.
- Connect it to your vacuum sealer or handheld unit and run the vacuum.
- Check the seal, the lid should be sucked down and not flex.
What it is great for
Dry goods shine: coffee, nuts, flour, grains, dried herbs and dehydrated foods, plus fridge leftovers you want to last longer. See what to store in vacuum-sealed jars and, for coffee, the best jar sealer for coffee.
Frequently asked questions
How do I vacuum seal a mason jar?
Put a canning lid on the jar, place a jar-sealer attachment (wide or regular mouth) over it, connect it to a vacuum sealer or handheld unit, and run the vacuum until the lid seals.
Is vacuum sealing a jar the same as canning?
No. It removes air to keep food fresh but does not heat-process or sterilise, so it cannot make low-acid foods shelf-stable. Keep perishables refrigerated.
Can I reuse the lids?
For vacuum storage (not heat canning), lids can often be reused as long as they still seal. Check each seal holds before relying on it.