External (suction) sealere.g. FoodSaver
Chamber sealere.g. Avid Armor USV20
Vacuum Sealer vs Chamber Sealer
The verdict
Buy an external sealer for dry or firm food, a low price and a compact size. Buy a chamber sealer if you regularly seal liquids or in volume, where cheaper flat bags and clean liquid seals justify the price and footprint.
At a glance
| Factor | External (suction) sealer | Chamber sealer |
|---|---|---|
| Handles liquids / soups | Poorly (freeze first) | Excellent |
| Bag type | Textured / embossed (pricier) | Flat (much cheaper) |
| Purchase price | Low | High |
| Cost per bag over time | Higher | Lower |
| Size & weight | Compact, stores away | Large, lives on counter |
| Sealing speed in volume | Slower, cool-down needed | Faster cycles |
Which is better for…
The most important vacuum-sealer decision is not the brand, it is the type. External and chamber sealers remove air in fundamentally different ways, and that difference decides how well they handle liquids, what bags they use, and how much they cost to own. Here is the honest head-to-head.
Short answer
Buy an external sealer if you mostly seal dry or firm food, want something affordable and compact, and seal in modest amounts. Buy a chamber sealer if you regularly seal liquids, marinades, or soups, or you seal in enough volume that cheaper flat bags outweigh the higher purchase price and larger footprint.
How each one removes air
An external sealer sucks air out through the open mouth of a textured bag, then heat-seals it. Simple and cheap, but any free liquid gets dragged toward the seal bar. A chamber sealer puts the whole bag inside a chamber and evacuates all the air at once, so pressure equalizes and liquids stay put. That single design difference drives everything below.
| Factor | External (suction) | Chamber |
|---|---|---|
| Handles liquids/soups | Poorly (freeze first) | Excellent |
| Bag type | Textured / embossed (pricier) | Flat (much cheaper) |
| Purchase price | Low | High |
| Cost per bag over time | Higher | Lower |
| Size & weight | Compact, stores away | Large, lives on the counter |
| Sealing speed in volume | Slower, cool-down between seals | Faster cycles, built for batches |
| Best user | Home cook, occasional to regular | Sous vide, hunters, high-volume, wet food |
The cost story people miss
Chamber sealers look far more expensive until you count bags. External machines need embossed bags or rolls, which cost meaningfully more per foot than the flat bags a chamber sealer uses. If you seal a lot, the bag savings can offset the higher machine price within a year or two. If you seal a little, they never will, and the external sealer stays the smarter buy. Run your own bag-per-month estimate before deciding.
Where each one wins
Choose external if: you portion and freeze meat and vegetables, want something you can store in a cupboard, and don't want to spend chamber money. Most households land here.
Choose chamber if: you sous vide constantly, process game or bulk meat, seal marinades and liquids, or simply seal in enough volume that cheap flat bags change the economics.
See real models of each type side by side in the specification database, or read our category picks.
Frequently asked questions
Can an external vacuum sealer seal liquids?
Not well. It pulls air through the bag opening, which drags liquid toward the seal bar. Freeze liquids solid first, or use a chamber sealer.
Why are chamber sealer bags cheaper?
Chamber sealers use flat bags because they remove air from the whole chamber, not through channels in the film. Flat bags cost much less per foot than embossed bags.