ZIPPER GALLON FREEZER BAGS: Glad zipper freezer bags are BPA free and an essential for a busy kitchen. DOUBLE SEAL LOCK ZIPPER: With a quick glide of the Yellow and Blue Make Green Seal these one gallon freezer bags provide an airtight zip seal | Glad Zipper Freezer Bags, Gallon, 15 Bags/Box (57034), Yellow | Quill