Laminate and Kraft rope handle bags can be printed with both CMYK and coated spot colours. Kraft Paper Twist and Tape handle bags can only be printed with uncoated spot colours.
For large areas of colour we recommend that you use spot colours, as this only uses one plate. Creating large flat areas in CMYK needs 4 plates to make up one colour. With a spot colour the first bag will match the last bag.
Lamination can affect the appearance of the printed colour. Even though Lamination is transparent, it has its own opaqueness, both this and the heat process affect printed colours. Some more then others.