9 x 12 Booklet Envelope - Open Side - 28# White - (9 x 12) - Large Envelope Series (Jumbo) (Box of 500) A Quantity of 500 - 9 x 12 Booklet Envelope - 28# White 28# White Wove Paper - Regular Gummed Flap Great for mailing Invoices, statements, catalogs or announcements. This envelope may be sourced from any one of a number of top brands. Ships via UPS Ground