Supremex Single Window Envelope #10, White, 500/Box

No. 10 envelopes offer a smooth seamless interior for perfect insertion every time and a standard window for easy mailings. With this design, you'll have no catching on seam while inserting so it reduces jamming and downtime. Easy-to-use envelope has an open side and outside side seam. 24 lb. envelopes meet Canadian and U.S. postal standards.