Heat shrinkable film containing polyamide/copolyamide blends

A process for producing a biaxially-oriented multilayer film, comprising:(a) extruding a tubular multilayer tape comprising:(i) a first outer layer comprising a polyolefin,(ii) a second, core layer comprising a polyamide blend comprising nylon 6 blended with at least about 5% by weight of copolyamide,(iii) a third layer which is a core layer comprising polyolefin or an oxygen-barrier layer comprising at least one member selected from ethylene/vinyl alcohol copolymer, polyvinylidene chloride copolymer and polyacrylonitrile, and(iv) a fourth, outer layer comprising a polyolefin;(b) inflating the tape so that the tape is biaxially oriented by stretching in a transverse direction and machine direction, so that a tubular multilayer film is formed.