Choose an external sealer if you seal mostly solid foods a few times a week, want something compact and affordable, and don’t mind pre-freezing liquids.
Choose a chamber sealer if you regularly seal soups, marinades or brines, process large volumes, or want cheaper bags — and you have the counter space and budget for a heavy machine.
How each type works
External (suction) vacuum sealers
You place the open end of a bag into a narrow trough and close the lid. A pump pulls air out through the bag’s opening, then a heated bar melts the plastic closed. Because air must travel along the bag, external sealers need embossed or textured bags with channels. They’re light, compact and the most common type in home kitchens.
Chamber vacuum sealers
You put the whole bag inside a chamber and close the lid. The pump removes air from the entire chamber, so pressure inside and outside the bag stays equal — liquids don’t get pulled toward the pump. When the cycle finishes, the seal bar closes the bag and air rushes back in, pressing the bag tightly around the food. Chamber sealers use smooth pouches.
Side-by-side comparison
| Factor | External sealer | Chamber sealer |
|---|---|---|
| Liquids, soups, marinades | Difficult — pre-freeze first | Yes, seals liquids directly |
| Bag type | Embossed/textured (more expensive) | Smooth pouches (generally cheaper) |
| Size and weight | Compact; typically a few pounds | Bulky; roughly 25–85+ lb for home/prosumer models |
| Upfront cost | Lower | Much higher |
| Bag size limit | Bag width limited by seal bar; length unlimited with rolls | Bag must fit inside the chamber |
| Back-to-back sealing | Many models need cool-down breaks | Designed for repeated cycles |
| Maintenance | Clean drip tray and gaskets | Gaskets plus pump care (oil changes on oil-pump models) |
| Canisters and jars | Often via accessory port | Varies by model |
Where external sealers win
- Space and price. An external sealer stores in a cupboard and costs a fraction of a chamber machine.
- Long items. With a roll, you can make a bag as long as you need — handy for whole fish fillets or racks of ribs.
- Accessories. Many have accessory ports for canisters, jar sealers and handheld attachments.
Where chamber sealers win
- Liquids. Stock, chili, brines and marinated meats can be sealed without freezing first.
- Volume. They’re designed to run cycle after cycle.
- Bag cost. Smooth chamber pouches are generally cheaper than embossed bags, which adds up for heavy users.
- Control. Most let you adjust vacuum and seal times.
Oil pump vs dry pump chamber sealers
Traditional chamber machines such as the VacMaster VP215 use an oil rotary pump: deep, consistent vacuum, but heavy (about 84 lb for the VP215) and the oil needs periodic changing. Newer home-oriented machines such as the Avid Armor USV32 use a dry pump that needs no oil and weighs far less (about 26 lb listed). If you don’t want routine pump maintenance, a dry pump is the easier option.
| Product | Sealer type | Vacuum settings | Wet / moist food | Seal bar | Built-in bag storage | Bag cutter | Weight | Warranty | Price & availability | Our guide |
|---|---|---|---|---|---|---|---|---|---|---|
| VacMaster VP215 Chamber Vacuum Sealer Best Chamber Sealer |
Chamber | Adjustable vacuum & seal time | Yes — seals liquids | 10 in removable | No | No | ≈84 lb | 1-year limited | Check on Amazon | Read guide |
| Avid Armor USV32 Chamber Vacuum Sealer Best Countertop Chamber |
Chamber | Adjustable vacuum & seal time | Yes — seals liquids | Not stated | No | No | ≈26.4 lb | Not stated | Check on Amazon | Read guide |
| Nesco VS-12 Deluxe Vacuum Sealer Best Overall |
External | Dry / Moist + double seal | Moist mode; pre-freeze liquids | Bags up to 11.8 in | Yes | Yes | Not stated | 1-year limited | Check on Amazon | Read guide |
| Avid Armor A100 Vacuum Sealer Best for Bulk Meat |
External | Automatic vacuum & seal, manual controls | Pre-freeze liquids | 12 in | No | No | Not stated | 1 year | Check on Amazon | Read guide |
← Swipe the table sideways to see every specification →
Which should you buy?
- Occasional sealing, small kitchen: an entry-level external sealer or a handheld pump.
- Weekly meat, leftovers and sous vide: a mid-range external sealer with moist mode — see our best vacuum sealers.
- Hunters and bulk buyers sealing solids: a heavy-duty external sealer with a wide, fan-cooled seal bar.
- Frequent liquids, brines or very high volume: a chamber sealer.
Answer six questions in the Vacuum Sealer Finder for a personalised recommendation.
A long-running commercial-style chamber machine with an oil rotary pump and removable 10 in seal bar — it seals soups, marinades and liquids that suction sealers can't. Affiliate link. Prices and availability change — check Amazon for current details. A 130-watt double-pump external sealer with dry, moist and optional double-seal settings plus built-in roll storage and a cutter — a well-rounded choice for weekly sealing. Affiliate link. Prices and availability change — check Amazon for current details.VacMaster VP215 Chamber Vacuum Sealer
Nesco VS-12 Deluxe Vacuum Sealer
Frequently asked questions
Can an external vacuum sealer seal liquids?
Not directly — the pump would draw liquid toward the machine. Freeze soups and sauces in a container first, then seal the frozen block. Some sealers have moist or pulse modes that help with damp foods, but not with free liquid.
Can I use chamber bags in an external sealer?
No. Smooth chamber pouches have no air channels, so an external sealer can’t draw air out of them. Embossed external bags will work in a chamber sealer but cost more.
Are chamber vacuum sealers better for sous vide?
They make sealing marinated foods and liquids much easier, which many sous vide cooks value. But a good external sealer produces seals that hold up perfectly well in a water bath when foods are prepared properly.
Affiliate disclosure: As an Amazon Associate, we earn from qualifying purchases. This does not affect our editorial opinions or recommendations. Learn more.
