Kwik Fill® bags are compatible with all automatic packaging equipment and are packaged on an industry standard core. These bags feature an opaque white back. Like all Kwik-Fill® bags, they're made with Elkay's exclusive Tuf-R® resin for the added strength that's needed to withstand the stresses of automated packaging equipment. Kwik Fill® bags are pre-opened for easy loading and feature precise perforating for easy separation, so they also work great for manual applications. Because this film is made from 100% virgin low density polyethylene, it imeets FDA requirements for food contact.