Quality String-Tie Inter-Department Envelopes, 12 x 16 Inches, 50 per Pack, Printed Both Sides - 71 Entries Extra Large 12x16 Inter-Departmental Envelopes - Printed Both Sides - Space for up to 71 entries - Re-usable Envelopes featuring String-Tie and Button closure. 3 Boxes Across Style - Each box is printed with NAME and DEPARTMENT Ideal for protecting and transporting blueprints, proofs, artwork, maps, architectural drawings and other large material that should be stored flat. Flaps are ungummed for repeated use. Heavyweight 28-lb Paper Stock 50 Envelopes per Pack