The EZ-Cup Vapometer is used to measure water vapor permeability (WVTR). The Vapometer consists of a lightweight aluminum cup and an aluminum threaded flanged ring with two neoprene gaskets with a Teflon seal that secures the specimen in place. This Vapometer was designed specifically to eliminate edge leakage and to provide a fast and secure sealing of the specimen between the gaskets. Specimens are easily loaded and sealed in place by twisting the threaded upper aluminum flange into position.