Because plastic bags, one bag is packed into several parts based on the NMT label and stick NMT label only one that can not be scanned only get a 1-to-1 in all this.
Because plastic bags 1 bag packing into many pieces according to the number on the NMT label and will stick NMT label only 1 one only, cannot scan the job. A 1 per 1 all one .