10" x 12" document mailers are perfect for mailing and storing important documents. Mailers open on the long side for easy insertion and retrieval. Extra-long flap keeps contents secure when not sealed. Fully gummed flap provides a secure seal when needed. Heavyweight, 50 lb. brown Kraft adds extra durability.10" x 12" document mailers are perfect for mailing and storing important documents. Mailers open on the long side for easy insertion and retrieval. Extra-long flap keeps contents secure when not sealed. Fully gummed flap provides a secure seal when needed. Heavyweight, 50 lb. brown Kraft adds extra durability.