# Envelope Sigel DU443 DIN lang (no window) – Sigel DU443, DIN lang format

**URL:** https://aio.lv/en/product--sigel-du443--11034177
**Data updated:** 2026-02-13 15:48 (EET)
**Category:** Home Goods Accessories
**Manufacturer:** sigel
**Manufacturer code:** DU443
**EAN:** 4004360778094
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 25.99 €
**Prices and availability valid until:** 2026-07-20 23:59
**Price without VAT (21%):** 21.48 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--sigel-du443--11034177

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 23.07.2026 | free |
| Pickup points | 28.07.2026 | 1.89 EUR |
| Courier delivery to door | 28.07.2026 | 4.99 EUR |

## Summary description

Sigel DU443 DIN lang envelopes without window are standard-sized postal envelopes designed for mailing and gifting during the Christmas season. Manufactured by Sigel (model DU443), these DIN lang envelopes provide a plain front suitable for labels or decorative elements, and no transparent window. They are intended for letters, cards or invoices and simplify addressing, inserting and sealing for personal or business use.

## Long description

Sigel DU443 DIN lang envelopes without window are standard-sized postal envelopes designed for mailing letters, cards and invoices. The plain front surface provides space for address labels or decorative elements, while the absence of a transparent window ensures privacy and a consistent appearance. These envelopes suit both personal and business correspondence and are compatible with standard DIN lang documents and mailing equipment.
Advantages
These Sigel DU443 envelopes combine a uniform DIN lang format with a smooth, unwindowed front that simplifies printing or manual addressing. The construction supports easy insertion and reliable sealing, and the plain face allows use of stamps, printed labels or handwritten addresses without the alignment constraints of windowed envelopes. They are produced to standard dimensions for compatibility with mail-sorting systems and common office workflows.
Suitable for
Mailing business letters, invoices and reminders
Sending greeting cards and invitations
Organizing internal office paperwork and correspondence
Use with address labels, stamps or printed fronts
Key specifications
Format: DIN lang (standard long envelope size)
Front design: plain, no transparent window
Material: paper suitable for mailing and printing
Closure: adhesive sealing flap
Compatibility: fits DIN lang documents and standard mail processing equipment
How to use
Insert the document or card flat into the envelope so that the address area on the front remains clear for labeling or stamping. If printing addresses or using labels, ensure alignment with the plain front surface before applying. Close the envelope using the adhesive flap and press firmly to secure the seal. For high-volume use, verify compatibility with your inserter or mailing machine by testing a single envelope first.
Usage recommendations
Store envelopes in a dry, flat place to prevent bending or moisture damage. When printing directly on the envelope, use settings appropriate for paper weight and perform a test print to confirm correct feed and alignment. For confidential documents, choose the unwindowed front to prevent visibility of contents and consider additional sealing methods if extra security is required.

## FAQ

### How much does the Envelope Sigel DU443 DIN lang (no window) cost, and is it available for purchase?

The price is 25.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 2 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 23.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All sigel products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized sigel service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

## Image

https://aio.lv/img/cache/product/11034177/66008842_large.webp