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Box of 500 bright white open-side booklet envelopes 9x12 inches 28lb vellum finish

WESTERN STATES

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

SKU CH-PPGK-XR9FR

Holds 9" x 12" documents in bright white, acid-free 28# sulphite paper with side seams and a remoistening seal, 500 per box

  • Bright white 96% brightness for crisp prints
  • Acid-free sulphite paper preserves documents long-term
  • SFI certified sourcing supports responsible forestry
  • Side-seam construction adds strength for bulky contents
  • Box of 500 envelopes supplies high-volume mailing needs

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.

Highlights

  • Bright white 96% brightness for crisp prints
  • Acid-free sulphite paper preserves documents long-term
  • SFI certified sourcing supports responsible forestry
  • Side-seam construction adds strength for bulky contents
  • Box of 500 envelopes supplies high-volume mailing needs

Specifications

BrandThe Envelope Supplies Shop

Questions about this item

Will the 9 x 12 inch open-side format feed reliably through my older laser printer?

The vellum imaging finish and 28# sulphite stock are designed for smooth feeding in most laser and inkjet printers, and the side-seam construction reduces curl that can jam legacy trays.

How can I confirm the envelopes meet the 96% brightness claim once they arrive?

Compare a sheet side-by-side with a known 96% reference under daylight-balanced light; the SFI-certified bright white sulphite should match the reference with no visible yellowing.

Does the box of 500 include any moisture-seal strips or do I need separate adhesive?

Each envelope has a factory-applied remoistening seal on the flap; no extra adhesive or seal strips are required — just moisten and press.

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