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White vellum-finish booklet envelope with poly window, side seams, box of 500

WESTERN STATES

WESTERN STATES Poly Window Open Side Booklet Envelope 6 x 9.5 24# White Side Seams Box of 500

SKU CH-74XF-YWQPK

White sulphite envelopes with a poly window and side seams, SFI certified, 92 % brightness, box of 500

  • SFI-certified white sulphite paper for responsible sourcing
  • 92% brightness gives crisp, professional appearance
  • Vellum finish provides smooth writing and printing surface
  • Side-seam construction adds strength for mailing durability
  • Box of 500 envelopes supports high-volume office needs

Office Mailing Envelopes

White sulphite booklet envelopes with a poly window are designed for high-volume business mailings such as invoices, statements and direct-mail pieces. The 24 lb stock and side-seam construction keep contents secure during automated insertion and postal handling. Each box contains 500 envelopes for efficient bulk processing.

Printer and Inserter Compatibility

Verify that your laser or inkjet printer accepts 24 lb vellum-finish paper and that the 1-3/8 by 4-1/2 inch window aligns with your document layout. Confirm the open-side, flap-down format matches the feed path of your folder-inserter or mailroom equipment before ordering.

Durable Construction Details

SFI-certified 92% brightness sulphite resists curling and feeds reliably through high-speed machines. Side seams placed underneath reduce edge bulk for smoother stacking, while the remoistening seal provides a tamper-evident closure without extra supplies. The 9.5 lb box weight allows easy handling and storage on standard shelving.

Highlights

  • SFI-certified white sulphite paper for responsible sourcing
  • 92% brightness gives crisp, professional appearance
  • Vellum finish provides smooth writing and printing surface
  • Side-seam construction adds strength for mailing durability
  • Box of 500 envelopes supports high-volume office needs

Specifications

BrandThe Envelope Supplies Shop

Questions about this item

What comes in the box and do I need to buy anything else to seal them?

The box contains 500 envelopes with a remoistening seal already on each flap, so no separate adhesive or sealing supplies are required.

How do I decide between the different paper weights or window sizes offered?

This listing is a single specification: 24 lb White Sulphite with a #4 poly window measuring 1-3/8 x 4-1/2 inches positioned 7/8 inch from the left and 5/8 inch from the bottom.

What does the 92 % brightness figure mean when the envelopes are printed and mailed?

The 92 % brightness gives a high-contrast white background that keeps printed addresses and barcodes sharp and easily readable by postal sorting equipment.

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