WESTERN STATES Open Side Booklet Envelope 9x12 28# Bright White 96% Acid Free Side Seams Box 500

Ideal for high-volume mailing

These open-side booklet envelopes measure nine by twelve inches and come in a box of five hundred. The bright white sulphite stock is SFI certified and acid free, making the envelopes suitable for everyday business correspondence and bulk mailings. A vellum imaging finish provides a clean surface for printing addresses or graphics. The remoistening seal closes securely without extra adhesive.

Capacity and headroom

Each box contains five hundred envelopes, giving ample supply for large campaigns or ongoing office use. The twenty-eight pound paper weight handles standard documents and folded inserts without tearing. Heavier multi-page packets or rigid items may exceed the practical capacity of the side-seam construction. Users sending thick catalogues or bulky goods should consider a larger format.

Build integration

The side-seam design feeds smoothly through most laser and inkjet printers, reducing jams during high-volume print runs. Acid-free stock prevents yellowing, so printed materials stay presentable in long-term storage. The flap-down orientation works with automatic inserting equipment, freeing operators from manual stuffing. No special trays or feed adjustments are required beyond standard envelope settings.