Exchange notes and files with coworkers using inter-department envelopes, which come printed for in-office use. The durable kraft paper will stand up to wear and tear as it's passed along from office to office, and the smooth surface is easy to write on to keep track of its location. Plus, the brown color and windowless design prevents others from viewing the contents, and the ungummed opening simplifies the process. Seam Type: Center; Flap Type: Hub; Security Tinted: No; Opening: Open End.