Patent ID: 8297491

Claim:
A carton precursor for a liquid tight carton comprising: a carton substrate ply having an obverse face and a reverse face and comprising multiple side-by-side thin-walled plastic tubes, a top ply of liquid impervious film laminated to the obverse face, and a bottom ply of liquid impervious film laminated to the reverse face, whereby the carton substrate ply is between the top ply and the bottom ply, and wherein the carton substrate ply has corner areas where the top and bottom plies are laminated together to form corner flaps, the corner flap in each corner area defines a pair of triangles, one of the triangles in each corner area is connected to an end wall of the carton precursor and the other triangle in each corner area is connected to a side wall of the carton precursor, and in each corner area a side wall is joined to an end wall by the corner flap made into double thickness by a diagonal fold to impose an erectable shape on the carton precursor.