WESTERN STATES Open End Catalog Envelope 10" x 13" 28# White Self-Sealing Box 500

White catalogue envelopes for bulk mailing

These 10 by 13 inch open end envelopes use 28 pound white sulphite paper with a 92 percent brightness vellum finish. A centre seam construction and extended flap create a professional look for catalogues, brochures or multi-page documents. Each box holds 500 envelopes weighing 27 pounds total. The self-sealing latex adhesive activates with pressure so no moistening is required.

Upgrade from standard letter envelopes

The larger format and heavier stock replace letter-size mailers when documents must stay flat and uncreased. The jump is worth it for high-volume senders who need a clean presentation without folding brochures or reports. The self-seal closure speeds processing compared with traditional gummed flaps that need water or a sponge.

Limits of pressure-sensitive adhesive

Latex self-seal adhesive relies on firm pressure across the full flap width; light contact can leave gaps that open in transit. The bond weakens if envelopes are stored in high heat or humidity for long periods, so climate-controlled storage is advisable. The open end design suits hand insertion but may not feed reliably through every automatic inserting machine.