Method of forming composite packages

In a method of packaging a product in a composite package which comprises a tubular top section of paperboard having closure panels at the top and interruptions at the corners of angularly related side walls thereof, and a bag of heat shrinkable film material adapted to accommodate said product, the steps of

• (a) bringing together said top section and said bag so that the mouth of the bag overlaps a portion of the top section to cover said interruptions,
• (b) causing at least local areas of said bag which cover said interruptions to be heated so that said local areas of the bag are drawn into tension across said interruptions whereby the bag becomes attached to said top section,
• (c) inserting said product into the bag through said top section, and thereafter
• (d) closing the closure panels associated with said top section.