- matte surface
- made of environmentally friendly polypropylene with a thickness of 40mic
- for A4 size documents
- opening from the top
- transparent, antistatic
- reinforced and colored edge
- number of holes: 11
- external dimensions: 230x304mm

It is important to know

Before choosing Donau U A4 matte 40 mic envelopes with red edge, it is worth considering which task takes priority: the immediate protection of individual documents or longer-term organization in the office. This type of folder is intended for quick insertion of sheets and basic protection, but it has some practical limitations that can be overlooked if we focus only on the basic data.

• L and U envelopes are best suited for storing single sheets or small bundles and are not optimal for larger sets.
• The open format on one side makes insertion fast, but transferring multiple documents at once or frequent mobile use brings a slightly increased risk of content loss.
• A colored border can facilitate visual categorization by project or department, but the color logic should be consistent for greater archive transparency.
• A single layer of material and standard thickness offer protection against surface wear, but full strength is not guaranteed for prolonged handling as with thicker or closing binders.

Source of editorial recommendations: general verifiable guidelines for product selection.

In practice

🟢 Use for real-time sorting of documents in drawers

Envelopes allow for quick insertion of individual sheets and make organization in drawers or cabinets easier.

🟢 Initial archiving of project materials

Suitable for initial collection or short-term storage of documentation that later needs to be rearranged or organized into larger folders.

🟡 Transfer between meetings or locations

They can serve for short-term transportation, but the open edge and basic protection mean that it is not optimal for a large number of documents or longer transport.

🟡 Presentations and document delivery

Good visual impression due to the colored edge and neat appearance, but protection of the contents is limited depending on the openness of the envelopes.

🔴 Long-term storage of large volumes of documentation without additional protection

For thicker or frequently handled materials, stronger folders with full closure or greater thickness are more suitable.

Answers to frequently asked questions

How robust are these envelopes in everyday office use?

It offers basic protection against damage and creasing, but caution is recommended for more intensive or prolonged handling.

Are these envelopes suitable for quickly sorting several different documents?

Yes, the transparent design and colored border allow for quick visual orientation, which is useful when sorting by projects or departments.

Can the open shape cause the leaves to fall out?

With a larger number of sheets or frequent transportation, there is a greater chance of failure, so we recommend caution when using it on the go.

Is the colored border functional or is it primarily an aesthetic choice?

The colored border has practical value for color coding and transparency, and makes it easier to separate by content.

Description updated: October 2026

Why buy from ENAA?

• The fastest in Slovenia: more than 95% of orders are delivered the next business day.
• The descriptions are designed neutrally, with an emphasis on clear information, and we leave the decision to the buyer.