The Length of the carton becomes the Width of the liner, plus 5 to 10mm
eg: 385cm + 5mm = 390mm

The Width of the carton becomes the Gusset of the liner, plus 5 to 10mm
eg: 265mm + 5mm = 270mm

The Height of the carton = 165mm

Add the Width 265mm of the carton to the Height 165mm of the carton, plus 100 to 150mm
eg: 265mm + 165mm + 150mm = 580mm

Size of liner required: 390mm x 270mm x 580mm for carton 385 x 265 x 165mm