Chamber vs. External Vacuum Sealer
Short answer: Choose a chamber sealer for liquids, sous-vide, and volume — it evacuates air from a chamber around the bag, seals soups and marinades, and uses cheap flat pouches. Choose an external (edge) sealer for occasional sealing of dry foods; it's cheaper and compact but needs textured bags and struggles with liquids.
| Dimension | Chamber | External (edge) |
|---|---|---|
| Liquids & marinades | Seals soups, brines, and sous-vide reliably | Struggles — can pull liquid toward the seal/pump |
| Bags | Inexpensive flat (smooth) pouches, any size | Requires embossed/channel bags (cost more) |
| Volume & duty | Built for continuous commercial use | Lower duty; pauses to cool between bags |
| Vacuum depth | Deeper, more consistent vacuum | Shallower; varies by bag and seal |
| Footprint & price | Larger, heavier, higher up-front | Compact and lower cost |
| Best for | Sous-vide, portioning, wet foods, high volume | Light dry-food sealing, small prep areas |
Frequently asked questions
Can an external sealer do sous-vide?
It can seal for sous-vide in a pinch with the right channel bags, but it can't reliably seal liquids or brined items and isn't built for volume. Serious sous-vide and any wet packaging call for a chamber sealer.
Why are chamber-sealer bags cheaper?
Chamber machines equalize pressure inside the chamber, so they work with plain smooth flat pouches — far cheaper than the embossed/channel bags an external sealer needs to draw air out through the bag's mouth.
Which should a restaurant buy?
Most commercial kitchens choose a chamber sealer for its ability to handle liquids, cheaper bags, and continuous-duty build. An external sealer suits very light or occasional use.