Leuchtturm and velour: acid-free?

I am considering buying a suitcase like this one:

https://www.amazon.co.uk/Leuchtturm-Cargo-322142-Empty-L-Shaped/dp/B0056972V0

I can also buy coin trays.

Do you know wheter it is acid-free or not?

The producent is "Leuchtturm" I think, and the blue stuff is called "velour".

Can anyone tell me that it is acid-free?

 

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I imagine that if the case and the trays you can purchase is made specifically for coins then it should be Acid Free.

 

To what does the L-shape refer ? I believe they are related to the "lighthouse" line of coin/stamp products.