These 4" x 6" Loc N' Press On Adhesive Backed Reclosable Zipper Locking Envelope Bags are great for documents like shipping information, job tickets, or shipments of small parts. 4 x 6 stick-on reclosable bags are also excellent for work-in-progress projects where papers are frequently removed, checked, and returned to the zipper bag. These 4 x 6 .002 plastic bags with adhesive have a pressure-sensitive adhesive backing that will stick to most surfaces. Our 4in. x 6in. 2 mil Press-on Zipper Locking Bags or stick-on reclosable shipping bags, which keep out moisture, dirt, and other contaminants and are made from sturdy 2 mil poly film.