Ship your liquids with confidence when you use Labelmaster's Polypropylene Caps with F217 Liners. Designed to fit poly F-style bottles from 4 to 320 oz., these wide-mouth white caps cut down on spillage when filling or dispensing. The F217 liner, which has a low-density foam core between two solid layers of low-density polyethylene, exhibits excellent chemical resistance, low moisture transmission rate, and strong taste and odor resistance. You can rest assured knowing that your liquid shipments will arrive intact as we put our bottle caps through extensive testing to ensure tight seals and unrivaled durability.