A laminating carrier is a sheet of specially-coated heavy white card stock folded on one side and open on the other three sides. The item to be laminated is placed inside a laminating pouch and then placed inside the carrier before being fed through the pouch laminator. Not all pouch laminators require carriers, so consult your machine’s user manual to determine whether yours needs a carrier or not. The carrier helps prevent adhesive from getting onto your machine’s rollers.