

White Open End Windowless Envelope
White Open End Windowless Envelope – Professional Document Mailing Solution for Businesses
In the daily operations of any enterprise, sending and receiving official dispatches, contracts, invoices, and confidential documents is a regular occurrence. To ensure confidentiality, courtesy, and to build a professional image in the eyes of partners, choosing the right type of envelope is extremely important. The white open end windowless envelope is the optimal solution for storing and forwarding postal items, meeting the strict standards of modern offices.

Outstanding Features of White Open End Windowless Envelopes
Modern and Convenient Open End Design
Unlike traditional open side (horizontal opening) envelopes, the open end design (vertical opening) makes opening, inserting documents inside, or taking them out much faster and easier. This design provides a neat, sturdy feel and optimizes storage space for thick document files.
Smooth White Paper with Standard Thickness
The product is made from high-quality paper with a basis weight of 80 gsm and a brightness rating of 92. The paper surface is smooth and features good ink absorption, making it easy for businesses to print logos, brand information, or handwrite the recipient's address clearly without smudging or bleeding. With a thickness of 80 gsm, the envelope ensures the necessary rigidity to protect the shape of the documents inside during transit.
High Security Thanks to Windowless Design
The completely sealed design (without a clear plastic window) helps maximize the security of the information inside. Outsiders cannot see the content or recipient information without opening the envelope. This is an ideal choice for accounting documents, financial invoices, or human resource records that require high confidentiality.
Common Dimensions for Offices
To best serve the diverse needs of the corporate sector, this product line is divided into 3 standard sizes:
- Dimensions 120 x 220 mm: Specialized for sending invoices, receipts, payment vouchers, invitations, or small-sized folded documents.
- Dimensions 180 x 240 mm: Suitable for thick invoice stacks, accounting documents, A5-sized materials, or small catalogs.
- Dimensions A4 (250 x 350 mm): Large size specialized for mailing dossiers, economic contracts, and A4-sized documents flat and intact without folding.
Detailed Product Technical Specifications
Below is a summary table of the technical specifications of the white open end windowless envelope lines to help customers easily choose the right item code for their needs:
Order Code | Dimensions (mm) | Thickness (Basis Weight) | Flap Type | Packaging Unit | Brightness |
|---|---|---|---|---|---|
012522 | 120 x 220 mm | 80 gsm | Ungummed | Pack / 100 pcs | 92 |
012521 | 180 x 240 mm | 80 gsm | Ungummed | Pack / 100 pcs | 92 |
012545 | 250 x 350 (A4) mm | 80 gsm | Ungummed | Pack / 100 pcs | 92 |
Applications of White Open End Envelopes in Businesses
Thanks to its minimalist yet sophisticated design, this envelope line is widely used in various company departments:
- Accounting - HR Department: Sending paper invoices, tax documents, payrolls, and confidential labor contracts to employees and partners.
- Sales - Marketing Department: Sending introductory letters, product catalogs, event invitations, or economic contracts to clients.
- Office Administration: Storing internal documents, incoming and outgoing official dispatches in a scientific and orderly manner.
Frequently Asked Questions (FAQ)
1. Does this envelope product come with a pre-applied adhesive layer on the flap?
This white open end envelope line features an ungummed flap. Businesses can flexibly use double-sided tape, glue, or staples to secure the flap depending on their packaging needs.
2. What does the paper brightness rating of 92 signify?
A brightness rating of 92 is the standard index for the brightness of high-quality office paper. This level of whiteness makes the envelope look clean and professional, while providing excellent contrast when printing or writing ink on the surface.
3. Can the A4 size (250 x 350 mm) accommodate a thick file of documents?
The 250 x 350 mm dimensions are reasonably larger than the standard A4 paper size (210 x 297 mm), allowing you to comfortably fit a thick stack of about 20-30 A4 sheets without worrying about tearing the edges of the envelope.




















