Given the advertised capacity of 12 pens I was concerned about the size but I was able to fill the inside with 10 Zebra Sarasa pens and the outside pocket with 5 signo blx pens. It was tight but doable and is now my go-to piece of everyday clothing. The material seems durable and I haven't had any issues with the buttons. I throw it in my bag every day and it's holding up great. Knowing I'm using this case outside of its intended capacity I can't use the inner mesh pockets for anything else, but the filing feature when using this case was surprisingly handy.
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