8 x 4 x 18" - 1 Mil Gusseted Poly Bags. These light-weight expandable side gusseted open top plastic poly bags are best used for lightweight products. Expandable sides and fitted bottom make packing bulky or irregular shaped items easier. Sizes listed are the inside usable space of the bag. Bags are manufactured from 100% virgin, high clarity low density polyethylene (LDPE) film. Meets FDA and USDA specifications for contact with food products. Close bags with bag tape, twist ties, or by heat sealing. Select from many different gusseted poly bag sizes and mils to fit your packaging, shipping, displaying and storage needs.