While regular freezer bags can be used for sous vide, vacuum bags are generally recommended for optimal results. The water displacement method can help remove air from freezer bags, but they are more prone to leaking and may not provide as consistent temperature control as vacuum-sealed bags.
Sous vide cooking relies on precise temperature control, and removing air from the bag is crucial for efficient heat transfer. Vacuum bags are designed to create an airtight seal, preventing water from entering and ensuring the food is fully submerged and evenly cooked. Regular freezer bags, on the other hand, are not designed to be airtight. While you can use the water displacement method (slowly lowering the bag into water to force air out before sealing), it's not as effective as vacuum sealing. There's a higher risk of leaks, which can compromise the cooking process and potentially ruin your food. Furthermore, the presence of air in a regular freezer bag can insulate the food, leading to uneven cooking and inaccurate temperature readings. For best results, especially for longer cooking times or delicate foods, investing in a vacuum sealer and vacuum bags is highly recommended. If you choose to use freezer bags, opt for heavy-duty ones and double-check the seal before and during cooking.
If using freezer bags, clip the open end of the bag to the side of the pot to keep the seal above the water line and prevent water from seeping in. This adds an extra layer of security against leaks.