The following samples are different sizes, but have been scaled to easy viewing. Interstate can handle virtually any envelope size. The actual sizes in inches appear under each envelope. The front of the envelopes are shown on the left side, and the backs on the right.
6 x 9 Booklet, 1 3/8 x 4 window on back
5 3/8 X 9 3/4 Booklet 1 3/8 x 4 1/4 window on back, 4 x 5 window on face.
5 1/4 x 8 1/8 booklet, 2 1/4 x 7 window on face
6 x 9 Booklet, 1 3/8 x 4 window on back