(Sarah Read is an author, editor, yarn artist, and pen/paper/ink addict. You can find more about her at her website and on Twitter.)
Global Arts makes some great cases for the pen addict on the go. This 36-Pencil Roll isn't my favorite of their products, but my complaints are all nitpicks that arise from comparing it to other cases of the same brand.
On the outside, the case feels well made, with soft, sturdy canvas fabric and strong elastic. The snap closure is reliable--it's never come undone, even when being tossed around in a backpack.
Inside, the case starts to feel a little cheap to me, in terms of materials. The nylon lining and pocket zipper feel a bit light and flimsy and don't really give me that sense of durability that I like in my cases.