10 x 13 Booklet Envelope - Open Side - 28# White (10 x 13) - Jumbo Envelope Series (Box of 1000) A Quantity of 1000 - 10 x 13 Booklet Envelope - 28# White 28# White Wove Paper - Regular Gummed Flap Great for catalogs, calenders, advertisements or announcements This envelope may be sourced from any one of a number of top brands. Ships via UPS Ground