3" x 20" - 2 Mil Flat Poly Bags. Most popular used Poly Bags for general light to medium weight products to protect them from dirt, dust and moisture. Bags are manufactured from 100% virgin, high clarity polyethylene film. Meets FDA and USDA specifications. Close bags with twist ties, bag tape or by heat sealing. Available in case quantities. 1000/Case.SHPPB374. PB374. Shoplet select Shoplet select 2 Mil Flat Poly Bags.