Booze Buddy Concealable Flasks Rum 4 Pack (2 8oz, 2 16oz.) Nonmetallic- undetectable to metal detectors or x-ray scanners. Collapsible- Folds flat or rolls up easily to conceal in your pocket & other tight spaces. Reusable- Washes clean with soap & warm water. Screw top- Convenient leak proof screw top. Durable- High quality food grade plastic is odor proof, leak proof, & puncture resistant.