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White rectangular open-side booklet envelopes, side seams, vellum finish, box of 500

WESTERN STATES

WESTERN STATES Open Side Booklet Envelope 9 x 12 24# White Side Seams Box of 500

SKU CH-4VST-085B4

Holds 9" x 12" documents in white sulphite paper with vellum finish, side seams and a remoistening seal, supplied in a box of 500

  • SFI-certified paper supports responsible forestry
  • 92 % brightness gives crisp, readable prints
  • Vellum finish feels smooth and professional
  • Open-side format speeds bulk insertion
  • Box of 500 covers high-volume mailing

Open Side Booklet Envelope 9 x 12

These white sulphite envelopes measure 9 by 12 inches and feature an open side design with two side seams underneath. The vellum finish provides a smooth surface for writing or printing addresses. They are suited for office mailing, catalogues, or booklets requiring a professional presentation. Each box contains 500 envelopes for high-volume use.

Check printer and inserter compatibility

Verify that your printer or mailing machine accepts 9 by 12 inch open side envelopes with side seam construction. The remoistening seal requires moisture to activate, so ensure your equipment supports gummed flaps or plan for manual sealing. Confirm the 24 pound paper weight feeds reliably through your specific paper path to avoid jams.

SFI certified vellum finish and side seam durability

The white sulphite paper carries SFI certification and offers 92 percent brightness for crisp print contrast. Side seam construction places the seams along the edges, creating a flat front panel ideal for labels or direct printing. The 24 pound stock resists tearing during handling while the vellum texture feels substantial in hand. A 20 pound box weight makes bulk storage manageable.

Highlights

  • SFI-certified paper supports responsible forestry
  • 92 % brightness gives crisp, readable prints
  • Vellum finish feels smooth and professional
  • Open-side format speeds bulk insertion
  • Box of 500 covers high-volume mailing

Specifications

BrandThe Envelope Supplies Shop

Questions about this item

What comes inside the box and is anything else needed to use these envelopes?

The box contains 500 open side booklet envelopes measuring 9 by 12 inches with side seams, white sulphite paper, vellum finish and a remoistening seal. No additional items are required.

How do I decide between the 24 pound weight and the 20 pound box weight when ordering?

The 24 pound figure is the paper basis weight describing sheet thickness, while the 20 pound figure is the actual shipping weight of the full 500 count box. Both refer to the same product.

What does the 92 percent brightness rating mean for everyday printing and writing?

A 92 percent brightness level gives a clean white surface that produces sharp contrast for both inkjet and laser output as well as handwritten text.

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