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