For sending flyers and pamphlets to product catalogs and invitation cards, the 6 X 9 Brown open end envelopes are office essentials. These envelopes are made from highly durable 28 lbs/104 gsm brown Kraft paper. The added durability of these envelopes makes them perfect for sending heavier stacks of documents. These envelopes can comfortably accommodate unfolded sheets of A5 paper or single-folded A4 documents. The brown color resembles the color paper grocery bags and they look both formal and sophisticated. This envelope has a simple windowless design with a rectangular flap lined with re-moistening gum. These envelopes offer a winning blend of affordability, durability, and simplistic styling.