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This #9 blue envelope, often used as a return envelope, has a typical V-flap design with no windows. These envelopes an internal enclosure size of 3.75 X 8.675 inches. This makes it sufficient for carrying a few pages of folded A4 documents. They comfortably fit inside a #10 envelope, a reason why they are often used as business reply envelopes.
Pretty colors! Needed envelopes to distinguish 2 different groups so they are really handy.
My order arrived perfect!