Vacuum sealing Ziplock bags is a clever kitchen hack that removes air from standard resealable bags using water displacement or a handheld vacuum sealer attachment, giving you many of the benefits of a dedicated vacuum sealer without the bulky machine. It works because removing oxygen slows down freezer burn, oxidation, and spoilage, keeping your food fresher for longer. This guide walks you through the two most reliable methods, along with tips and tricks to get a tight seal every time.
Ingredients
- 1 quart-sized or gallon-sized Ziplock bag (freezer-grade for best results)
- Food to be sealed (e.g., raw meat, vegetables, dry goods, or leftovers)
- Water (for the water displacement method)
- Optional: paper towels (to pat food dry)
Instructions
- Prepare your food: If sealing raw meat, pat it dry with paper towels to remove excess moisture—this helps the seal hold and prevents ice crystals. For vegetables, blanch them first (boil for 2-3 minutes, then ice bath) to stop enzyme activity and preserve color and texture.
- Place food in the bag: Put the food into the Ziplock bag, leaving at least 2 inches (5 cm) of space between the food and the top of the bag. This space is needed for the sealing process.
- Seal the bag almost completely: Close the zipper, but leave a 1-inch (2.5 cm) gap open at one corner. This is the escape route for the air.
- Method 1 – Water displacement: Fill a large pot or sink with water. Slowly lower the sealed portion of the bag into the water, keeping the open corner above the waterline. The water pressure forces the air out through the gap. Once most of the air is out, seal the remaining gap completely before removing the bag from the water.
- Method 2 – Handheld vacuum sealer (optional): If you have a handheld vacuum sealer with a zipper-lock attachment, place the nozzle over the small valve on the bag (if your bag has one) or use the accessory that fits over the zipper. Turn on the vacuum and let it run until the bag is tight around the food. Remove the nozzle and immediately press the zipper fully closed.
- Check the seal: Gently press the bag to feel for any remaining air pockets. If you feel air, reopen the zipper and repeat the process.
- Label and store: Write the date and contents on the bag with a permanent marker. Refrigerate or freeze as needed.
Tips
- Freezer-grade bags are a must: Regular Ziplock bags are thinner and more prone to cracking at low temperatures. Use freezer-grade bags for anything going into the freezer—they are thicker and designed to withstand cold.
- Don’t overfill: Leave that 2-inch (5 cm) headspace. Overfilling makes it impossible to remove air effectively and can cause the seal to fail.
- Dry food seals better: Moisture on the zipper can prevent a proper seal. Wipe the zipper area with a dry cloth before sealing.
- For liquids, freeze first: If you’re vacuum sealing soups, stews, or marinades, freeze them in a container first until solid, then transfer to the Ziplock bag and seal. This prevents liquid from being sucked into the vacuum or the water displacement method from washing it out.
Serving Suggestions
Vacuum-sealed Ziplock bags are perfect for meal prep: portion out marinated chicken breasts for grilling, pack individual servings of cooked rice or beans for quick lunches, or store fresh berries for smoothies. They also work great for sous vide cooking—the water displacement method creates a tight seal that keeps water out during the cook.
Variations
- Double-bagging: For extra protection against freezer burn or for strong-smelling foods like fish, place the sealed bag inside a second Ziplock bag and seal it normally (no need to vacuum the outer bag).
- Using a straw: If you don’t have a vacuum sealer, you can insert a straw into the small gap, seal the rest of the zipper, and suck the air out with your mouth. This works best for dry items like nuts or crackers.
- Vacuum canisters: Some handheld vacuum sealers come with canisters that work with Ziplock bags—check your device’s manual for compatible accessories.
Storage and Reheating
Vacuum-sealed Ziplock bags are not a substitute for proper refrigeration. Refrigerate perishable foods within 2 hours of sealing, and use within 3-4 days. For freezing, vacuum-sealed bags can keep food safe indefinitely, but quality is best within 6-12 months for meat, 8-12 months for vegetables, and 3-6 months for leftovers. To reheat, remove food from the bag and cook it according to the original recipe. If you’re reheating sous vide, you can place the sealed bag directly in hot water (140°F / 60°C) for 30-45 minutes, but never boil the bag—it may melt or burst.
Frequently Asked Questions
Can I vacuum seal Ziplock bags with a regular vacuum cleaner? No, a household vacuum cleaner is not designed for food and could introduce dust or bacteria. Use a handheld vacuum sealer specifically made for food storage, or use the water displacement method.
Why does my bag lose its vacuum after a few hours? This usually happens if the zipper wasn’t fully sealed or if there’s a tiny hole in the bag. Check the zipper for debris, and inspect the bag for punctures. Also, if you’re sealing food with sharp edges (like bones or hard spices), wrap them in a paper towel or use a bag with a thicker gauge.
Is water displacement safe for raw meat? Yes, as long as you use cold water and keep the open corner above the waterline so no water enters the bag. The water is just a tool to push air out; it doesn’t contaminate the food. Always pat the bag dry after sealing before refrigerating.
Can I reuse Ziplock bags after vacuum sealing? Yes, if they contained dry goods or were used for sous vide, you can wash them with soap and hot water and reuse them. However, if they contained raw meat, it’s safer to discard them to avoid cross-contamination.
Does vacuum sealing replace the need for blanching vegetables? No. Blanching is essential to stop enzyme activity that causes loss of flavor, color, and texture over time. Vacuum sealing removes oxygen, which slows spoilage, but it doesn’t deactivate enzymes.
Can I vacuum seal liquids directly? It’s tricky because liquids can be sucked out during the process. Freeze the liquid first, or use a vacuum sealer with a “liquid� setting if you have one. For Ziplock bags, the water displacement method works if you’re careful, but freezing is the most reliable.
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More recipes to cook
Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes
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