BUILT FOR DAILY OFFICE ROUTING: Designed for interdepartmental use, these envelopes keep documents organized and protected as they move through busy offices, mailrooms, schools, and government buildings DURABLE 28 LB KRAFT PAPER: Heavyweight brown kraft stock resists wear and tear, making these envelopes strong enough for frequent handling and long-term reuse SECURE STRING & BUTTON CLOSURE: Classic string-and-button design keeps contents safely contained while remaining easy to open and close for repeated access throughout the day TRACKING-FRIENDLY DESIGN: Five narrow-ruled columns on each side provide plenty of space for signatures, dates, and routing notes to maintain accountability QUICK CONTENT VISIBILITY: Punched holes on both sides allow instant visual confirmation of contents without opening the envelope, saving time while protecting documents