These Quality Park® jumbo kraft envelopes have an ungummed flap to help you store, transport and organize large items. Made of durable 28-lb kraft paper that withstands extensive handling and reuse. Perfect for storing blueprints, artwork, large photos, sewing patterns, classroom decorations, posters and so much more. Seam Type: Side; Flap Type: Cheese Blade; Security Tinted: No; Opening: Open End.