How to Vacuum Seal Without a Machine
You don't need a $100 sealer to start sous vide. The water displacement method uses water pressure to push air out of a zipper bag — it's the classic beginner technique, and it works for 90% of sous vide cooks. Here's how to do it right.
Our top pick
Ziploc Freezer Bags
Thick freezer-grade bags that survive the water bath without leaking.
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Quick comparison
| Pick | Why we like it | |
|---|---|---|
| Ziploc Freezer Bags | Thick freezer-grade bags that survive the water bath without leaking. | View → |
| Large Pot for Bath | Your sous vide vessel — the bag goes in, water pushes air out. | View → |
Ziploc Freezer Bags
Editor’s PickThick freezer-grade bags that survive the water bath without leaking.
- + Cheap
- + Reusable-ish
- + Everywhere
- − Not fully vacuum
- − One-time use mostly
Free shipping on eligible items
Your sous vide vessel — the bag goes in, water pushes air out.
- + Big capacity
- + Cheap
- − Needs a circulator
Free shipping on eligible items
Buying advice
Step 1: put the food in a gallon freezer bag with seasonings. Step 2: slowly lower the sealed-but-open bag into the water bath, keeping the opening above water. Step 3: let the water pressure push air out until the bag clings to the food — the opening stays dry. Step 4: seal the zipper just above the waterline. Step 5: clip the bag to the pot edge so it doesn't float. The result is 95% as good as a machine seal for most cooks.
FAQ
Is water displacement as good as a vacuum sealer?
For most sous vide, yes — the food is fully immersed, so remaining air matters little. Machine sealing wins for long-term freezer storage.
What bags should I use?
Freezer-grade zipper bags — they're thicker and survive the bath. Regular storage bags leak at temperature.
How do I keep the bag from floating?
Clip it to the pot rim, or weigh it with a heavy spoon. Floating food cooks unevenly.
Can I reuse the bags?
Yes for sous vide — wash and dry them. Replace when they develop leaks or smells.
When should I buy a real sealer?
When you cook sous vide weekly, seal liquids/marinades, or freeze in bulk. Until then, the zipper method is perfectly fine.
Ready to cook perfectly?
Our top pick for this guide — check today’s price and clip any on-page coupon on Amazon:
Ziploc Freezer Bags
Thick freezer-grade bags that survive the water bath without leaking.
As an Amazon Associate we earn from qualifying purchases.
Want exact temps and times? Use our free sous vide calculators.