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Box of 500 white 9 x 12 inch open side booklet envelopes with center seam and vellum finish

WESTERN STATES

WESTERN STATES Open Side Booklet Envelope 9 x 12 28# White Center Seam 500

SKU CH-ZFJV-GVP4W

White sulphite booklet envelopes with centre seam and vellum finish, SFI certified at 92 % brightness, 500 per box

  • SFI certified paper supports responsible forestry
  • 92% brightness gives crisp contrast for printed text
  • Vellum finish adds professional feel to mailed documents
  • Center seam construction strengthens envelope for bulky inserts
  • 500 envelopes per box covers high-volume mailing needs

Open Side Booklet Envelope 9 x 12

These envelopes measure 9 by 12 inches and use an open-side design with a center seam. They are supplied in a box of 500 pieces for high-volume mailing or office storage needs. The white sulphite paper carries SFI certification and a 92 percent brightness rating. This stock suits everyday correspondence, invoices and document filing.

28# Paper Weight and Remoistening Seal

The 28-pound basis weight provides a substantial feel while remaining compatible with standard office printers and copiers. Each envelope uses a traditional remoistening seal that requires moisture to activate the adhesive. Users needing peel-and-stick or self-seal closures will need a different product. The flap-down configuration supports manual or machine insertion workflows.

Vellum Finish and Center Seam Construction

A vellum finish gives the surface a smooth, professional texture suitable for handwriting or printing. The center seam runs vertically down the middle of the back panel, adding strength for heavier inserts. The box weighs 22 pounds, so plan storage space accordingly. Buyers requiring window envelopes or side-seam construction should look elsewhere.

Highlights

  • SFI certified paper supports responsible forestry
  • 92% brightness gives crisp contrast for printed text
  • Vellum finish adds professional feel to mailed documents
  • Center seam construction strengthens envelope for bulky inserts
  • 500 envelopes per box covers high-volume mailing needs

Specifications

BrandThe Envelope Supplies Shop

Questions about this item

Should I choose the 9 x 12 size or a different dimension for my booklets?

The 9 x 12 open side format fits standard letter sheets folded in half without trimming, and the centre seam keeps the spine flat for machine inserting.

How does 28# sulphite paper perform when printed and mailed?

At 28# weight with 92% brightness and a vellum finish, it feeds cleanly through laser and inkjet printers, resists show-through, and withstands automated sorting equipment.

What does the remoistening seal actually do on a high-volume mailing line?

The gummed flap activates with a standard moistener or sealing machine, giving a secure closure that meets postal requirements for 500-piece bulk mailings.

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