6 x 9 Booklet Envelopes - Open Side - 60# Cougar Natural (6 x 9) - Jumbo Envelope Series (Pkg of 50) A Quantity of 50 - 6 x 9 Booklet Envelopes - Cougar Natural 60# Cougar Natural Paper - Standard Gummed Flap. Great for sending cards, invitations, letters, and more. This envelope may be sourced from any one of a number of top brands. Ships via First Class Mail