When pouch laminating, the most popular thickness for laminating letter size sheets is 5 mil or thicker. Thicker pouches are easier to load since they are more rigid than thin pouches, but they cost more. With Revo Automatic Laminators, you eliminate manual loading of a pouch which allows you to use thinner 2 and 3 mil films. You get the same protection, preservation and enhancement, with lower material costs.