- 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

When choosing A4 U-shaped envelopes for business use, it is crucial to consider the way you handle documents on a daily basis and your requirements for transparency and content protection. Before purchasing, be sure to check whether this type of envelope meets your needs for protection, quick visual recognition and organization.

• The U-format envelope allows for very quick insertion and removal of individual documents, which is convenient for a dynamic workflow, but due to the open top edge, it only provides basic protection against external influences.
• The matte version reduces reflection and offers a slightly better view of the content, but is not recommended when a completely clear display of all details is required.
• The 100-piece package is particularly suitable for larger offices or users who are establishing a more extensive system of visual document categorization (e.g. colored borders for different projects or departments).
• The yellow border allows for color coding, but it has a visual impact primarily at the edges – if you need stronger distinction between categories, this color logic should be maintained consistently with other widgets in the archive.

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

In practice

🟢 Organizing and archiving individual documents in cabinets

U envelopes are very suitable for quick sorting and archiving of individual sheets, where permanent integration into documentation is not required.

🟢 Color coding of documents in offices

Due to their yellow border, they are very suitable for simple color separation of projects, departments or types of material in larger archives or between colleagues.

🟡 Preparing materials for meetings and short-term transmission

U envelopes are useful for quickly preparing meeting materials, but the open top edge means that documents are not well protected when carried and handled repeatedly.

🔴 Long-term transfer of a large number of documents outside the office

For frequent transmission of a large number of sheets, U envelopes with a thickness of 40 mic are less suitable due to limited protection and the possibility of the contents falling out.

Answers to frequently asked questions

Does a matte envelope allow for good readability of documents?

The matte surface reduces light reflection and increases readability, but with very fine print or photographs, blurring may be more pronounced than with completely transparent envelopes.

Is the yellow border suitable for color coding?

Yes, the yellow edge of the envelope allows for basic color coding of documents and facilitates visual categorization in the archive.

How many documents is each envelope recommended for?

The 40 mic thick U envelope is best suited for storing a small number of sheets (up to a few dozen), as it is not intended for bulky or very thick materials.

Description updated: October 2026

Why buy from ENAA?

• We deliver more than 95% of orders the next business day - reliability in business purchasing.
• We prepare descriptions and recommendations neutrally, so you can easily choose the optimal product based on your needs.