HERKKA #10 Double Window Security Envelopes, White, 500 Count, Self-Seal, 24 lb

HERKKA #10 double window security envelopes are made for business and household mail, with a 500-envelope supply, 24 lb paper, and a self-seal closure.

• 500 envelopes per box — keep a ready supply for recurring mailings.
• #10 size: 4-1/8 x 9-1/2 in (10.5 x 24.1 cm), 24 lb paper — sized for common business correspondence.
• Two address windows — show the sender and recipient addresses through the envelope.
• Printed security tint — makes enclosed contents difficult to see through.
• Full-width self-seal strip — closes without tape or glue sticks.
• Compatible with most inkjet and laser printers — print addresses and mailing details on the envelope.

For regular billing runs, invoice mailings, check mail, and everyday correspondence, these envelopes bring address visibility and a privacy-focused interior together in one format. Their double-window layout is intended for mail where the sender and recipient details can show through the envelope, while the security pattern helps obscure the contents. They also suit home mail and legal or business correspondence.

What can I mail in HERKKA #10 envelopes?

HERKKA #10 envelopes are designed for invoices, checks, billing statements, and everyday business or home mail. The long format accommodates common business documents and return-envelope use. Use them for routine outgoing mail when the address information is positioned to align with the two windows.

• Suitable for invoices and QuickBooks invoices.
• Made for business statements, checks, and legal mail.
• Can be used for return envelopes and everyday home correspondence.

How do the two address windows work?

The two windows let the sender and recipient addresses show through, making the format useful for mail prepared with matching address placement. This can keep both addresses visible without writing them on the outside by hand. The white envelope has a printed security pattern to help keep sensitive contents from being easily read through the paper.

• Dual-window layout for sender and recipient details.
• White exterior with a privacy-oriented security tint.

How does the self-seal closure work?

HERKKA envelopes close with an adhesive strip across the envelope width, so sealing does not require separate tape or a glue stick. The closure is designed to stay sealed during mailing and help prevent larger documents from splitting the envelope.

• Self-sealing adhesive closure.
• Full-width seal for mailing larger documents.

Will HERKKA #10 envelopes suit my printer and mailing routine?

Each box contains 500 smooth, thick-paper envelopes that work with most inkjet and laser printers. The stated size is 4-1/8 x 9-1/2 in (10.5 x 24.1 cm), so compare it with your mailing and printer requirements before preparing a large batch. Their format is suited to repeated office mailings as well as everyday household use.

• 24 lb paper weight.
• Printer compatibility covers most inkjet and laser printers.
• Bulk quantity for ongoing business tasks.

These envelopes suit offices, small businesses, and households that send statements, invoices, checks, or other routine correspondence and want visible address windows with a privacy-tinted interior. The 500-pack, printable #10 format and tape-free closure make them a practical fit for regular mailing tasks.