The JARMAX is a full chamber vacuum sealer built around a serious purpose: standing mason jars upright and sealing them in batches. Six pint jars or four quart jars, sealed in one cycle with nothing but their own lids. Dry goods and freeze-dried stores for the pantry, and broth headed for the fridge or freezer.
6 pint jars or 4 quart jars, sealed in one cycle
Jars stand upright. Lids seal from the pressure of returning air.
Full chamber sealer: pouches, 7 mil Mylar, marinate mode
Free shipping, 48 contiguous states30-day returns on vacuum sealers1 year warranty, registered automaticallyDesigned and supported in Lenexa, Kansas
ETL ListedReal support from Eric, six years at our bench
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The problem
Putting Up Food for the Long Haul Deserves a Machine That Respects the Work.
Hose on. Pump. Hose off. Next jar. Twenty-four pint jars the hard way is twenty-four separate cycles. After a full freeze-dryer run or a season's harvest, that is a long night for a serious pantry.
Most chamber vacuum sealers are too shallow for mason jars to stand upright, so the choice has always been one jar at a time with an attachment, or laying them on their sides and hoping the glass holds. Neither option is worthy of the effort that went into that food.
The JARMAX was designed for a different standard. Load the chamber. Close the lid. Every jar in the batch seals on the same cycle.
The solution
Six Jars. Their Own Lids. One Cycle. No Compromise.
The JARMAX is a full chamber vacuum sealer with a chamber 8.5 inches deep, built specifically so quart mason jars stand upright inside it. It seals four quart jars or six pint jars in a single cycle using the jars' own standard two-piece lids. No hose. No special caps. No attachments.
Take the jars out and this is still the machine that belongs on a serious counter. It seals chamber pouches and Mylar up to 7 mil, runs a marinate cycle on an open dish, and handles broth, brine, and sauce in jars because the jars stand upright and the liquid stays where you put it.
Fill and lid
Fill your jars and put the lids and rings on. Leave the rings loose so air can escape. Regular and wide mouth both work, with no hose or attachment. Use quality mason jars (we recommend Ball) and check each one for chips or hairline cracks first, since a flawed jar can implode under vacuum.
Load the chamber
Stand up to four quart jars or six pint jars in the chamber. Use the wire shelf for half pints. Close the glass lid.
Press one button
Set the vacuum time to 25 seconds and press Vac and Seal. The whole batch seals on the same cycle while you watch through the lid.
The one setting to remember: for jars, set vacuum time to 25 seconds, then press Vac and Seal.
6 pint jarsstanding upright, one cycle. About 8 half pints on the floor, a dozen with the wire shelf.
Same price range as the JARMAX. Deeper seal bar (11.5 in), takes pouches up to 11 x 13 in, chamber 3.5 in tall. Designed for pouches first. Pick the JARMAX if jars are your main job.
Fits any vacuum sealer with an accessory port. Seals one jar at a time, regular and wide mouth. The right choice if you already own a vacuum sealer and only need to seal occasional jars.
How the jars seal
Don't take our word for it. Here is the physics.
A jar does not need a hose to seal. It needs the air around it removed and returned. That is what a chamber does, and it is what makes the whole batch seal at once.
1. The air leaves together
The pump empties the whole chamber. Air inside each jar slips out past its lid at the same time, so pressure drops evenly inside and outside the jar.
2. Nothing gets pulled
Because the pressure is the same on both sides, nothing is sucked across the opening. Powder stays down. Liquid stays in the jar.
3. The air comes back, outside only
When the cycle ends, air rushes back into the chamber but not into the jars. That outside pressure pushes every lid down tight.
★★★★★
“I've ran approx 30 mylar bags without issue and vaccuum sealed about 15 mason jars without a single issue.”
Sam H., verified buyer. Owns the USVXL. February 2026.
★★★★★
“I use it every week to store freeze dryer food. I have more confidence that my food investment will not spoil.”
Jennifer G., verified buyer. Owns the USV20. June 2026.
The JARMAX is new, so these are verified owners of our other chamber sealers, in their own words. Each one says which machine they own.
“I’ve ran approx 30 mylar bags without issue and vaccuum sealed about 15 mason jars without a single issue.”
Sam H., verified buyer. Owns the USVXL, February 2026.
The JARMAX is new. Sam owns our USVXL. The chamber physics are the same. The two-piece lid method is the same. The result is the same.
Vacuum sealing and canning are different missions. Here is the honest line between them.
This is the question we get asked more than any other, and it deserves a straight answer. Canning uses heat to make food safe on a shelf. Vacuum sealing removes air at room temperature. The JARMAX does the second job, not the first. Knowing the difference protects the mission.
Canning (water bath or pressure)
Vacuum sealing a jar
What happens
The filled jar is heated to 212°F or 240 to 250°F under pressure for a tested length of time.
Air is pulled out of the jar at room temperature. No heat touches the food.
Does it kill bacteria?
Yes, when the right method and time are followed. Pressure canning destroys botulism spores.
No. Removing air does not kill anything.
Shelf stable after?
Yes, when a tested process is followed.
Only if the food was already dry and shelf stable before sealing.
Refrigeration after?
Not needed for a correctly processed jar.
Required for any perishable food, same as before sealing.
If a food would normally require refrigeration, freezing, or heat processing to be safe, vacuum sealing does not change that.
When something needs attention, you don't ship it overseas and wait months.
The JARMAX carries a one year warranty against defects in materials and workmanship, registered automatically at purchase. No paperwork, no registration card.
After the warranty period, Avid Armor still repairs its machines. You submit a request through the Avid Armor repair intake form and the machine comes to the same workbench where it was designed. For questions and day-to-day support, the Avid Armor help center is staffed and active. Real support, in the USA.
The JARMAX runs a dry, oil-free pump. Some buyers ask whether a dry pump can be serviced after the warranty period. Avid repairs its machines. That is what the repair intake and help center are for.
What fits
If it stands 7 inches or under, it stands in the JARMAX.
Drawn to scale. Wide mouth jars of the same volume are shorter, so they fit too. Heights are approximate and vary a little by brand.
Jar
About how tall
Stands upright?
Per cycle
Half pint (8 oz)
3.9 in
Yes
8 on the floor, up to about 12 with the wire shelf
Pint (16 oz)
5.2 in
Yes
6
Pint and a half (24 oz)
6.8 in
Yes
Several. Count depends on the jar.
Quart (32 oz)
6.9 in
Yes
4
Half gallon (64 oz)
9.1 in
No, too tall
Seal outside the chamber with the accessory hose and a jar attachment, sold separately
“Even though you can sit a jar (on its side) to seal dry goods, I’ve already exploded two jars.”
A verified buyer of our USV32 chamber sealer, May 2026. Not a JARMAX review.
You can lay jars on their side to force them into an ordinary chamber. But a jar under vacuum on its side can crack, and glass in your chamber ends the job. The JARMAX stands them upright, the way they are meant to seal. Glass is still glass: inspect every jar for chips and cracks before you load it, leave the rings loose, and use the 25 second jar setting.
Full specifications
Jar capacity
4 quart jars or 6 pint jars upright per cycle. About 8 half pints on the floor, up to a dozen with the wire shelf. Regular and wide mouth.
Chamber
12 x 11 x 8.5 in | 12 L usable
Seal bar
10.5 in, double wire, with pouch clamp
Pouches
Chamber pouches and Mylar up to 7 mil. Two filler plates for small batches.
Controls
Vacuum time 25 to 99 seconds, seal 3 to 9. Marinate mode. Seal only. Analog vacuum gauge.
Pump
Dry, oil-free. No oil changes.
Lid
Flat tempered glass, soft-close hinges
Accessory port
Yes, hose included. Canisters sold separately.
Size and weight
16 × 14 × 10.5 in, 25.5 in tall with the lid open, 26.3 lb
Power
120 V, 380 W, removable cord
Certification
ETL Listed
Warranty
1 year
In the box
JARMAX chamber vacuum sealer
Removable silicone chamber basket liner
30 vacuum pouches
Stainless wire shelf for stacking jars
2 filler plates
Replacement seal bar
Replacement lid gasket
Accessory port hose (for canisters)
Power cord
Quick-start guide and manual
Complete the setup
It holds the line on pouches, too.
A 10.5 inch double-wire seal bar, a pouch clamp, and adjustable heat control from 3 to 9 for everyday pouches to 7 mil Mylar. Thirty pouches ship in the box. These are the sizes that fit the JARMAX chamber.
6″ × 10″ and 8″ × 12″ chamber pouches. Both sizes fit the JARMAX seal bar.
Chamber pouches cost less over time. The textured bags a suction sealer needs run about $0.50 to $1.00 each. Smooth chamber pouches run about $0.15 to $0.25 each for the same size. Owners who seal every week say the savings cover the cost of the machine in the first year or two.
★★★★★
“Love that you can seal liquids. When you seal it lays flat and thin and quickly thaws when you need it.”
Betty J., verified buyer. Owns the USVXL. April 2026.
★★★★★
“I learned quickly to spread the product evenly through the bag before sealing it as nothing will move once the bag is sealed.”
Ron C., verified buyer. Owns the USV32. January 2026.
The JARMAX is new, so these are verified owners of our other chamber sealers, in their own words. Each one says which machine they own.
From the workbench
Designed, Tested, and Repaired in Kansas.
Avid Armor is an American small business out of Lenexa, Kansas. We have been designing chamber vacuum sealers since 2016, and we stand behind every machine we build. When a unit needs attention, it does not ship overseas and wait months. It comes back to the same workbench where it was designed, to people who know it inside and out.
The JARMAX is a chamber vacuum sealer from Avid Armor designed around mason jars. Its chamber is deep enough to stand four quart jars or six pint jars upright and vacuum seal them in a single cycle using the jars' own two-piece lids. It also seals chamber pouches and Mylar up to 7 mil on a 10.5 inch seal bar.
How do you vacuum seal mason jars in the JARMAX?
Fill the jars, put the lids and rings on with the rings left loose, stand the jars in the chamber, and close the glass lid. Set the vacuum time to 25 seconds and press Vac and Seal. The pump pulls the air out of the chamber and the jars together. When air returns to the chamber, it presses each lid down onto its jar and the vacuum inside holds it there.
What is the fastest way to vacuum seal a lot of mason jars at once?
Use 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. The Avid Armor JARMAX seals six pint jars or four quart jars per cycle, so twenty-four pint jars take four cycles instead of twenty-four.
How many mason jars fit in the JARMAX?
Four quart jars standing upright, or six pint jars, in one cycle. Half pints fit too, about eight on the chamber floor and up to a dozen using the stainless wire shelf that comes in the box. Regular and wide mouth jars both work.
Do mason jar vacuum sealers need special lids or attachments?
Not in the JARMAX. It seals a jar with the jar's own standard two-piece lid. There is no hose, cap, or attachment involved, because the whole jar sits inside the vacuum chamber.
Is vacuum sealing a 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 process is what makes canned food shelf stable. Vacuum sealing only removes air at room temperature. It does not cook, sterilize, or process food. University of Minnesota Extension states that vacuum sealing a jar does not result in the same shelf stable food that canning provides.
Can you vacuum seal liquids in mason jars?
Yes. A chamber sealer equalizes the pressure around the jar instead of pulling air across the opening, so liquid stays in the jar. Jars stand upright, so broth, brine, soup, and sauce stay put during the cycle. Sealed liquids are perishable and go in the refrigerator or freezer.
Can a mason jar break in a chamber vacuum sealer?
Any glass jar can fail under vacuum if it is chipped, cracked, or laid on its side. In the JARMAX, jars stand upright on their own base. Check each jar for chips and cracks, leave the rings loose, and use the 25 second jar setting.
Does the pump need oil or maintenance?
No. The JARMAX runs a dry, oil-free pump, so there is no oil to buy and no oil changes or conditioning cycles. A replacement seal bar and a replacement lid gasket ship in the box for the day those parts wear.
Is it safe to vacuum seal mason jars?
Yes, for the right foods. Vacuum sealing removes air at room temperature. It does not cook or sterilize food the way canning does. Dry, low moisture foods such as freeze-dried meals, rice, flour, and coffee can be stored on the pantry shelf once sealed. Anything perishable, such as broth or cooked meat, must still go in the refrigerator or freezer afterward.
What can you vacuum seal in mason jars?
Dry, low moisture foods are the best fit for the pantry shelf: freeze-dried and dehydrated foods, dried beans, rice, grains, flour, pasta, oats, coffee, and spices. Liquids and cooked foods such as broth, soup, sauce, and brine seal cleanly in jars too, but they still belong in the refrigerator or freezer afterward.
Will it fit under my cabinets?
Closed, the JARMAX is 10.5 inches tall, so it sits under standard upper cabinets. The glass lid swings up to 25.5 inches. Slide it forward to load it, then slide it back.
Is a dry pump less reliable than an oil pump?
Different trade-offs. An oil-lubricated pump can pull a deeper vacuum and is field-serviceable. A dry pump has no oil to check, no conditioning cycle, and no mess, making it the better fit for a home kitchen counter. Both pump types have long service lives when used as intended.
What are the shipping, return, and warranty terms?
Avid Armor ships free on orders over $50 within the 48 contiguous United States. Returns are accepted within 30 days for a full refund. A 15 percent restocking fee applies unless the unit is returned clean, like new, with all accessories in its original packaging. The one year warranty against defects registers automatically with your purchase.
Which mason jars fit in the JARMAX?
Half pint, pint, pint and a half, and quart jars all stand upright, in regular or wide mouth. The tallest jar that stands upright is about 7 inches. A half gallon jar is about 9 inches tall and does not stand in the chamber. Seal those outside the chamber with the included accessory hose and a jar attachment, sold separately.
Do the rings go on the jars?
Yes. Put the lids and rings on before the cycle, but leave the rings loose so the air can escape. After the cycle you can tighten the rings for storage.
Is the JARMAX only for jars?
No. It is a full chamber vacuum sealer first. It seals chamber pouches and Mylar up to 7 mil on a 10.5 inch double-wire seal bar, runs a one-button marinate cycle on an open dish, and has a seal only function for delicate items. The deep chamber is what lets jars and tall containers fit inside.
Where is Avid Armor located?
Lenexa, Kansas, just outside Kansas City. The JARMAX is designed and supported there, and Avid Armor has been designing chamber vacuum sealers since 2016.
Dependable. Durable. Built for the Long Haul.
Six pint jars or four quart jars, sealed in one cycle with nothing but their own lids. Designed and supported in Lenexa, Kansas, by people who answer when you reach them.
Free shipping in the 48 contiguous states30-day returns on vacuum sealers1 year warranty, registered automaticallyPay over time with Shop Pay Installments
