Plymor Heavy Duty Plastic Reclosable Zipper Bags, 4 Mil, 6" x 9" (Pack of 100)What size bag to order? Measure your item by its width, height, and depth because the plastic bag needs to fit all the way around it. Item width + item depth = bag width. Item height + item depth = bag height. Add an extra 1/2" to the bag width for the item to fit through the zipper opening.What is Mil? "Mil" is the plastic thickness. 4 Mil = .004", thicker than a standard freezer bag and excellent for heavy duty applications.How to open and close? For your convenience, the bag's top lip is offset, making it easy to separate the sides and open the zipper track. Separate the two sides of the bag's top lip and use your thumbs to gently pull the zipper track apart. To close, pinch together one end of the zipper and slide your finger and thumb along the zipper. Remember to squeeze excess air out of the bag as you close the zipper.How to use the bags? Reclosable bags are an essential organizing tool in any home, garage, office, retail store, warehouse or factory. Excellent for organizing and separating samples, food, candy, jewelry, bath bombs, cards, craft supplies, paper, office supplies, school supplies, hardware, collectibles, yarn, sewing kits, quilting supplies, toys, merchandise for resale, or makeup with protection from moisture and dust.