Premium Material: These mylar bags with an aluminum-foil layer with an aluminum-foil layer, which is not easy to break leakage, can prevent tearing and destroying, puncture resistance, and meet your long term dry storage requirements.Heat Sealing Bags: You can use heat sealing machine (not included) to seal away from light and oxygen barrier, prevent food being exposed to air, light, odors and moisture, these foil storage bags can extend the storage time of food.Convenient to Use: The U-shaped tear on the side for easy opening of the bag. The rounded edge design eliminates the risk of your hand being pricked by the corner. The storage bag can be vacuum sealed as well as heat sealing the open top, these foil pouch bags can extend the storage time of food.Multipurpose: These mylar aluminum foil bags are suitable for storing food, coffee, beans, candy, cookie, dried food, dried fruit and more, perfect for long term storage. Great for packing, storing, sampling and sorting.3 Size Choices: 3 different sizes can meet different requirements. 10 pieces foil bags in the size of 14 x 18 Inch, 10 pieces foil bags in the size of 10 x 14 Inch, 10 pieces foil bags in the size of 8 x 12 Inch.