The food storage bags are made of PE/PA and feature a small air valve that allows air to be discharged through a hand pump or a handheld vacuum seal. They are ideal for sous vide, freezing, and microwave defrosting. You will receive 30 bags per , ordered on demand, in 4 sizes: large 30 x 34 cm, large 26 x 34 cm, medium 26 x 28 cm, small 21 x 22 cm. For all kitchen needs. Upgraded double zipper closure provides a reliable seal to keep food fresh while minimizing odor and liquid leakage. The transparent design makes it easy to identify contents at a glance. Reusable storage bags that can be reused more than 15 times each. Using one reusable bag can up to 500 disposable bags, helping to reduce waste. Suitable for sandwich bag, snack bag, lunch bag, travel bag. Safe to use in the refrigerator, dishwasher, or boiling water. For routine maintenance hand washing is recommended, as dishwashers can damage the zipper. Vacuum bags can be cleaned with vinegar, dishwashing liquid and warm water, then stored in a clean and dry place before reuse. Use scenarios: Sous vide cooking: remove air via the valve, seal with a hand pump or handheld vacuum, then cook in a water bath. Freezing and defrosting: portion meals, vacuumseal to prevent freezer burn, and defrost as needed in microwave or conventional methods. Meal prep and travel: pack sandwiches, snacks, lunches, and travel items in reusable bags for organized storage and easy transport.