GPI - 4" x 6" Ultra Heavy-Duty Zip Bags, 8 Mil Extra-Thick Reclosable PuncturOur 8 Mil Ultra Thick Heavy Duty clear zipper bags are the thickest mil we carry in zip lock bags. They feature a prime quality reclosable zip that provide a strong grip and will keep items safely held inside. Customers choose this ultra thick plastic for packaging items that are sharp, heavy, or need more protection. They have an easy outer pull and hard inner pull, so items are simple to insert and kept safe inside once the zipper is pinched shut. A durable zipper closure ensures that contents remain secure and allows the bag to continuously be reused. These clear zipper locking bags are reusable and #4 recyclable. With plenty of sizes to choose from, you'll find one for every situation. The sizes are listed width by length from beneath the zipper and do not include the lip above. We always recommend going with a bag slightly larger than the product to ensure a comfortable fit.