The short answer: to vacuum seal a mason jar you need a clean jar, a standard two-piece lid, and something that pulls the air out. There are three ways to do it. A hose attachment and a handheld sealer each seal one jar at a time. A chamber vacuum sealer with a deep enough chamber seals several jars in a single cycle. All three work. Which one you want depends on how many jars you seal.
One thing before anything else. Vacuum sealing a jar is not canning. It takes the air out. It does not cook, sterilize, or make fresh food safe to keep on a shelf. We cover that plainly further down, because it matters more than any technique on this page.
The three ways to vacuum seal a mason jar
| Hose attachment | Handheld sealer | Chamber vacuum sealer | |
|---|---|---|---|
| What you need | A vacuum sealer with an accessory port, a hose, and a jar attachment | A battery powered jar sealer | A chamber vacuum sealer tall enough inside for your jars |
| Jars per cycle | 1 | 1 | As many as fit. Up to 6 pints or 4 quarts in the JARMAX, our jar-sized chamber sealer |
| Ring on or off while sealing | Off | Off | On, but loose |
| Liquids in the jar | Dry goods are the best fit | Dry goods are the best fit | Yes. The jar stands upright and nothing pulls across the opening |
| Best for | A jar or two at a time, with a sealer you already own | Occasional jars, no other equipment | A shelf of jars: freeze-dryer runs, harvest, bulk pantry days |
Before you start
- Use sound jars and lids. Run a finger around the rim and skip any jar with a chip. Use flat lids that are clean, flat, and not dented. Regular mouth and wide mouth both work.
- Leave some room at the top. Do not fill a jar to the brim, especially with powders or liquids. The National Center for Home Food Preservation notes that too little headspace can let food bubble up and keep a lid from sealing.
- Wipe the rim. Flour, coffee grounds, or a drip of broth on the rim is the most common reason a lid does not hold. Our guide to fixing common seal issues covers the rest.
- Know where the jar is going. Dry goods go to the pantry. Anything perishable goes to the refrigerator or freezer, sealed or not.
- Label and date the jar. Write the food and the sealing date on the lid. Store sealed jars in a cool, dry place out of direct light.
Method 1: a hose attachment on your vacuum sealer
If your vacuum sealer has an accessory port, this is the least expensive way in. It works with a suction sealer or a chamber sealer, and if you are not sure which you have, here is how suction and chamber vacuum sealers differ. A jar attachment hood sits over the lid, a hose connects it to the sealer, and the machine pulls the air out through the hood. Our jar attachment hood fits regular and wide mouth jars and comes with the hose.
- Fill the jar and wipe the rim clean. Leave some room at the top.
- Set the flat lid on the jar. Leave the ring off.
- Place the jar attachment hood over the lid so it sits flat on the jar.
- Push one end of the accessory hose into the port on your vacuum sealer and the other end into the top of the hood.
- Start the accessory cycle. On Avid Armor chamber sealers, hold the Auto Vac and Seal button for a full two seconds. The pump stops on its own when the jar is sealed.
- Pull the hose, lift the hood off, and screw the ring on for storage.
It is a good tool for a jar or two. The catch is in the last step: every jar is its own cycle, and the hose moves from jar to jar. A dozen jars is a dozen rounds.
Method 2: a handheld jar sealer
Handheld electric sealers are small battery powered pumps that sit directly on the lid. They need nothing else, which is their appeal.
- Fill the jar and wipe the rim clean.
- Set the flat lid on the jar. Leave the ring off.
- Press the sealer down over the lid so it sits flat, and start it.
- Hold it in place until it stops. Most take under a minute per jar.
- Lift the sealer off, check that the lid stays down, and screw the ring on.
The same limit applies. It is one jar, then the next one. We think of them as a dry goods tool.
Method 3: inside a chamber vacuum sealer
A chamber vacuum sealer does not pull air out of the jar through a hose. It pumps the air out of the whole chamber, with the jars sitting inside it. The air in each jar escapes past its loose lid at the same time, so the pressure drops evenly inside and outside the jar. When the cycle ends, air rushes back into the chamber but not into the jars, and that outside pressure pushes every lid down tight.
Two things follow from that. Nothing gets sucked across the opening, so powders stay put and liquids stay in the jar. And every jar in the chamber seals on the same cycle.
- Fill the jars and wipe the rims clean.
- Put the flat lids and the rings on. Leave the rings loose. The air has to escape past the lid, and a ring that is too tight can trap pressure and break a jar.
- Stand the jars in the chamber and check that the machine's lid closes fully with room to spare.
- Close the lid and run a vacuum cycle. On the JARMAX, set vacuum time to 25 seconds and press Vac and Seal.
- When air returns to the chamber, it pushes each lid down onto its jar. Lift the jars out.
- Press the center of each lid. It should not click or flex. Tighten the rings for storage.
Do not lay a jar on its side to make it fit. It is tempting in a shallow chamber, and it is how jars break. Two verified buyers of our USV32, a chamber sealer designed around pouches, said so in their reviews:
“Even though you can sit a jar (on its side) to seal dry goods, I’ve already exploded two jars.”
“I tried sealing a jar, but it imploded so I need to figure out what is an acceptable vac time for jars before I attempt that again.”
A jar is made to stand on its base. Stand it upright, check it for chips and cracks first, leave the ring loose, and use a short vacuum time. If the jar is too tall to stand in your chamber, use the hose.
The limit is height. Most chamber vacuum sealers are 3 to 5 inches tall inside. A pint jar is about 5.2 inches tall and a quart about 6.9, so on most machines only small jars, such as jelly jars, fit under the lid. Taller jars go back to the hose.
That is the reason we designed the JARMAX, a chamber vacuum sealer deep enough for a standing quart jar. It seals six pint jars or four quart jars in one cycle, using their own lids, with no hose and no attachment. It is still a full chamber sealer for pouches and Mylar. If you seal jars by the shelf, see how the JARMAX works and which jars fit, or compare your options in the best vacuum sealer for mason jars.
A fourth option: inside a vacuum canister
A jar can also be sealed inside a larger vacuum canister, like the three piece canister set we use around our own kitchen. Put the lid and a loose ring on the jar, set the jar inside the canister, and vacuum the canister through the accessory hose. The jar seals the same way it does in a chamber. It is one jar at a time, and the jar has to fit inside the canister.
How to check the seal
Press the center of the lid. A sealed lid is pulled down and does not click or flex. If it pops up and down, the jar did not seal. The usual causes are the same ones behind a vacuum sealer that will not seal. Wipe the rim, check the lid for dents, and run it again. If a lid will not hold after a second try, use a new flat lid. If the jar holds perishable food, put it in the refrigerator while you sort it out.
What to vacuum seal in mason jars, and what not to
The rule is simple. Where the food lived before you sealed it is where it lives after.
Pantry shelf: dry foods
For freeze-dried food, Penn State Extension says to put an oxygen absorber in the jar or remove the air with a vacuum sealer.
- Freeze-dried and dehydrated fruit, vegetables, and meals
- Dried beans, lentils, and peas
- Rice, grains, oats, and pasta. See vacuum sealing dry goods for storage.
- Flour, sugar, and baking staples
- Coffee beans bought in bulk, loose tea, and spices
- Dried herbs. For fresh ones, see storing herbs with a vacuum sealer.
Refrigerator or freezer: wet and cooked foods
- Bone broth, stock, and soup
- Sauces, brines, and marinades
- Blanched vegetables for the freezer
- Leftovers and meal prep
These seal well, and sealing helps them keep their quality in the cold. They are still perishable.
Not a job for vacuum sealing
- Making vegetables, tomato sauce, soup, or meat shelf stable. That takes canning.
- Oven or "dry" canning of flour, rice, or beans. University of Illinois Extension calls the practice unsafe, with no tested recipe behind it.
- Raw mushrooms, raw garlic and onions, and soft cheeses
See our guide to foods you should not vacuum seal.
Vacuum sealing is not canning
Canning heats a filled jar, to 212°F in a water bath or 240 to 250°F in a pressure canner, for a tested length of time. That heat destroys the organisms that cause spoilage and illness, including botulism spores, and it is what makes canned food safe on a shelf. The vacuum on a canned jar is a byproduct of that process.
Vacuum sealing skips the heat. It pulls air out at room temperature and kills nothing. Taking the oxygen away can even favor the bacteria that cause botulism if the food is moist, low in acid, and left at room temperature. That is why soup, sauce, vegetables, and meat in a vacuum sealed jar belong in the refrigerator or freezer, and why they must be canned with a tested process if you want them on a shelf.
University of Minnesota Extension puts it plainly: vacuum sealing a jar does not result in the same shelf stable food that canning provides. If a food would normally require refrigeration, freezing, or heat processing to be safe, vacuum sealing does not change that. For the longer version, read canning versus vacuum sealing mason jars.
Which method should you use?
- A jar or two, now and then. Use the jar attachment hood with the vacuum sealer you already own.
- No vacuum sealer at all, and only dry goods. A handheld sealer will do the job.
- Jars by the dozen. Freeze-dryer runs, a garden that all comes in at once, bulk rice and flour days, or broth by the stockpot. A chamber vacuum sealer that fits jars turns twenty-four rounds into four. That is what the JARMAX is for.
See the JARMAX: six jars a cycle or go straight to the JARMAX product page
What jar sealing owners told us
The JARMAX is new, so these are verified buyers of our other chamber sealers, in their own words. Each one says which machine they own.
Questions people ask
Do mason jar vacuum sealers actually work?
Yes. Pulling the air out of a jar lets outside air pressure hold the lid down, and the seal will hold as long as the lid and the jar rim are clean and undamaged. What changes between methods is speed. A hose attachment or a handheld sealer does one jar at a time. A chamber vacuum sealer with a deep enough chamber does several at once.
Do you need special lids to vacuum seal mason jars?
No. A standard two-piece canning lid works with all three methods, in regular or wide mouth. Use a flat lid that is clean, flat, and free of dents, and check that the jar rim has no chips.
Is it safe to vacuum seal mason jars?
Yes, for the right foods. Dry, low moisture foods such as dried beans, rice, grains, flour, pasta, coffee, and freeze-dried or dehydrated foods are a good fit for the pantry. Moist or cooked foods can be vacuum sealed too, but they are still perishable and must be kept in the refrigerator or freezer. Vacuum sealing does not kill bacteria and does not replace canning.
Is vacuum sealing a mason jar the same as canning?
No. Canning heats a filled jar long enough to destroy the organisms that cause spoilage and illness, and that heat is what makes canned food shelf stable. Vacuum sealing only removes air at room temperature. University of Minnesota Extension states that vacuum sealing a jar does not result in the same shelf stable food that canning and processing provide.
How long does food last in a vacuum sealed mason jar?
It depends on the food, and no food safety authority gives one number for everything. Removing oxygen slows staleness and rancidity in dry goods, so they keep their quality longer than they would in an open container. It does not extend the room temperature life of perishable food. Anything that needed the refrigerator before sealing still needs it after.
Can you vacuum seal liquids in a mason jar?
Yes. A jar stands upright, so broth, soup, sauce, and brine stay in the jar while the air comes out. A chamber vacuum sealer is the cleanest way to do it because it lowers the pressure around the whole jar instead of pulling air across the opening. Sealed liquids are perishable, so they go in the refrigerator or freezer.
How do you avoid botulism when vacuum sealing a mason jar?
Keep room temperature storage to dry goods. For any moist, low acid food, such as soup, sauce, meat, and most cooked food, vacuum sealing removes oxygen without killing anything, which can favor the bacteria that cause botulism if the jar sits at room temperature. Put those foods in the refrigerator or freezer, sealed or not, and use a tested canning process if you want them shelf stable.
What is the fastest way to vacuum seal a lot of mason jars at once?
A chamber vacuum sealer with a chamber tall enough for the jars to stand upright. It lowers the pressure around every jar at the same time, so all of them seal in one cycle. Hose attachments and handheld sealers do one jar per cycle. The Avid Armor JARMAX seals six pint jars or four quart jars per cycle.
Do the rings go on when you vacuum seal a jar?
It depends on the method. With a hose attachment or a handheld sealer, put on the flat lid only, seal the jar, then add the ring for storage. Inside a chamber vacuum sealer, put the lid and the ring on but leave the ring loose so the air can escape, then tighten it after the cycle.
Are mason jar vacuum sealers worth it?
If you store dry goods in jars, yes. Even a simple hose attachment keeps coffee, flour, and dehydrated food fresher than a jar that was just closed by hand. If you seal jars by the dozen, after a freeze-dryer run or a big harvest, a chamber vacuum sealer that fits jars saves real time because it seals several jars in one cycle.
Keep reading
- The best vacuum sealer for mason jars: 3 types, and why we designed the JARMAX
- The JARMAX: a chamber vacuum sealer for mason jars, six jars a cycle
- How to store freeze-dried food in jars and Mylar
- How to vacuum seal soup and liquids without the mess
- Canning versus vacuum sealing mason jars: what is the difference
- Foods you should not vacuum seal, and what to do instead
- Bulk food storage with a vacuum sealer
- Homesteading with a vacuum sealer
- Which Avid Armor chamber vacuum sealer is right for you
Sources
- University of Minnesota Extension: vacuum sealing mason jars
- National Center for Home Food Preservation
- Oregon State University Extension: vacuum packaging
- Penn State Extension: freeze-drying and storing freeze-dried food
- University of Illinois Extension: why canning flour is not safe
Updated September 21, 2026. Reviewed by Eric at the Avid Armor workbench in Lenexa, Kansas.
