KRAFT paper: Perfect for everyday home and business use. Kraft stock designed to give contents extra protection during mailing, storage, and handling. GUMMED FLAP: In addition to the clasp closure, these envelopes have a moisture-activated secure seal with deep gumming on the flap to create a permanent seal. The flaps close with full flap gum to endure humid climates and ensure the envelope stays sealed so your contents don't fall out. CATALOG ORIENTATION: Classic open end style enables fast, convenient stuffing for letters, legal documents, pamphlets, coupons, and other common mailers. LETTER SIZE: 12.2L x 9.2H. Package includes 5 string envelope pockets. ENVELOPE PACK: Pack of 5 envelopes accommodates a variety of small and large documents for home, office, business, legal, and more.