Laminating Pouch Carriers are used to protect your pouch laminator as well as the document you are laminating. The laminating pouch carrier will keep the excess adhesive from getting on your laminating pouch rollers during the laminating process. Carriers also work like an "ironing board" and help keep the pouch from curing or getting scratched as it moves though the machine.
Not all pouch laminator will accept the extra thickness needed to run a carrier & pouch though a machine, please check the owner's manual.