Made from 100% virgin film, poly bags on a roll are pre sealed on one end and open on the other for ease of use. To use a bag, simply pull the end of the roll and tear off a bag. Bags can then be closed with heat seal, bag tape or twist ties. Poly bags on a roll are available in two thicknesses: 2 mil and 4 mil. Bags are available in sizes as small as 2"x3" to those as large as 10"x15". Rolls contain 500 to 5000 bags, depending on the bag size. All poly bags on a roll are FDA & USDA approved for food contact.