Expansion envelope


Expansion envelopes are complicated to produce (especially in terms of gluing), therefore in this case we cannot offer a full range of formats and proportions. We neither make envelopes thinner than 20 mm nor smaller than A5-format size. The raw material most commonly chosen for this product to be made of is 130-170 g/m2 paper. While some archivists prefer paperboard from the 240-300 g/m2 range, it is worth noting that such solutions are quite costly and more difficult to apply. The flaps of expansion envelopes are longer that those of standard envelopes and should be slid inside the enclosure in order to attain better sealing quality. 

Please note: when placing an order for envelopes, make sure you provide us with their inner dimensions which take into account a safety margin added to the format of an object to be stored.

We use a high quality EVA adhesive to produce our envelopes. 

Products for A4 format
Index Material Dimensions 1 - 499 500 - 999 1000 and more Amount Total Sample
4655/18/5 white paper 170 g/m² 340x250x50 mm
Total: ...
  • length (a)
  • width (b)
  • thickness of the set of documents (c)


Add custom formats
Index a (mm) b (mm) c (mm) Amount Sample Comments
Omni-Box special formats

The Omni-Box system is a service whereby we produce single units and short series of archival storage products of non-standard constructions or in non-standard formats. 
See all products.

Who is Omni-Box for?

The Omni-Box storage products are mainly designed for those of our Clients who need:

  • one, a few or a few dozen units of storage products in a special, non-standard format;
  • to store a collection of books in such a manner that each volume is kept in a separate box;
  • storage products of non-standard construction.
How does it work?

First, our experienced designers make a computer design of a box or folder. After that, the product undergoes cutting and creasing by means of a digital plotter.

How should I measure an object to be stored?

Do you feel discouraged when you think of how much work it takes to take measurements of all the books to be stored in individual boxes? There is no need! For that purpose we can lend you, free of charge, the Bookmeter. With this device, which resembles an aluminium drawer, you can measure a book’s spine width, its width and height in just a few steps. It provides a precise measurement, and the data is wirelessly sent to a table on your computer. This helps you prevent making a mistake, which can happen when taking measurements manually. All you need to do is provide a reference number of each volume and… it’s done! 

This file is then used to produce a custom-made storage product for each volume.

BOOKMETER User Manual Omni-Box


Can I choose the material myself?

When preparing a quote for Omni-Box products, we usually decide which material to use based on the construction of the product, its size and the type of object to be stored in it. However, if you would like the product to be made from a different type of cardboard or paper than the one we suggest, write to us and let us know about it. If producing a given product from your preferred material is technically possible, we will take it into account when preparing the quote.  

Where do I find Omni-Box prices?

The prices of Omni-Box storage products are calculated on an individual basis. Select a construction and provide us with dimensions, and we will prepare a quote for you.