Transparent, biaxially oriented polyester films having a base layer
composed of at least 5% by weight of a thermoplastic polyester and from 10
to 95% by weight of a cycloolefin copolymer having a glass transition
temperature of less than 120.degree. C., possess very good water vapor
barrier properties and low haze at the same time. These films are
especially suitable for packaging foods and other consumables.
