The dünn series is a series of ultra-thin leather accessories made from ultra-thin leather, approximately 0.5 mm thick. Normally, the thinner or smaller the bag, the lower its storage capacity, but this is not the case with dünn. This time, we tested the storage capacity of dünn coin & cardcase.
Let's start with how it looks without anything in it.
It's rare to find a coin case this thin.
You can clearly see how thin it is when you pinch it with your fingers. Its thickness is only 2mm. It is just as thick as the layers of material. 
There is a bulge due to the zipper.
Coin cases tend to be bulky due to the contents inside, so eliminating unnecessary thickness may be more important than you think.
I packed as many cards as I could into this ultra-thin coin and card case.
Up until now, we have been emphasizing the thinness of the product, but the question that must arise is, ``Even if it's this thin, can the contents fit inside?''... So I filled it with as many plastic cards as I could. Right!
When I put it all the way in, the corner of the card started to pop out. The leather is thin and soft, so it will take some effort.
This is what it looks like from the zipper side. You can usually store the width of the zipper.
So, the main content is...
It's packed (lol) I only put in plastic point cards that can be made at the store. Let's just put aside the fact that I make too many cards... In this photo, 14 pieces are stored. It depends on the thickness of the cards, but you can stably store around 15 cards. However, this is only for cards, so if you also want to add coins, things will change again! That verification will be done another time!
https://dunnleather.com/products/dcc/