Once you’ve gathered all the necessities, place the food inside the bag and squeeze out the excess air. Seal the bag almost all the way, leaving a small opening in one corner. Then, dip the bag into the bowl of cold water. You want to keep the open part of the seal above water, while ensuring the bag’s contents are fully submerged. At this point, the pressure of the water will push out the air and you should see the plastic bag mold to the food, creating a seal-like effect. If it’s not sufficiently airtight, gently massage the bag to remove any air pockets.
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