Many companies use these for Optical Lenses. They are perfect for shipping and storage of lenses when you don't want objects to touch in transit. This regular duty 2mil Zip Top Bag has a 3 inch Vertical Compartment Seal that starts down 1" from the Zipper and divides the bag into 2 sections. These Compartment Seal Bags are often used for packaging 2 related goods while keeping them seperated in the same bag.