Booze Cruiser Plastic Cruise Flask Kit Perfect for Rum Runner Cocktails (4x8oz+funnel) Nonmetallic: undetectable to metal detectors or x-ray scanners. Reusable: Washes clean with soap & warm water. Durable: High quality food grade plastic is odor proof, leak proof, & puncture resistant. Freezable: Freeze overnight for cool drinks all day. Sturdy: Bottom gusset allows pouch to stand straight.