Zipper Top Bags. Dimensions: 12 inch W x 15 inch L Thickness: 4 mil Color: clear Closure: zipper Quantity: 500 pack Low Density Polyethylene is an excellent material for flexible packaging used for storage and transport of a variety of items. Seal top reclosable bags provide outstanding protection, convenience and economy. The zipper type seal closes securely and is easy to open and close time after time. Zipper extends the width of the bag and keeps products clean and free from moisture. Reclosable bags can be reused. These bags are excellent for storing, protecting and shipping all types of product. Reusable bags are great for storing first aid supplies when hiking, fishing or camping and they also are needed to keep your medications fresh when traveling. Great for storing parts & accessories.Because they are made only with virgin resin, they meet USDA requirements for contact with food products.