Business Source 20861 Business Card Laminating Pouches, 5 Mil, 2-1/4 x 3-3/4", Box of 100. Laminating pouches feature a thick, 5 mil construction to protect your business cards from damage caused by moisture, fading and abuse. Clear, transparent material prevents covering up important information to keep everything completely visible. Pre-trimmed laminating pouches are designed for use with thermal laminators.