The Taschenbegleiter (“pocket companion,” Google Translate tells me, but I’ve been amusing myself thinking up alternate translations, such as “satchel chum,” “bag buddy,” and “enclosure associate”) is a German-made personal organizer that comes in three sizes A4, A5, and A6. Each Taschenbegleiter is custom-assembled by Roterfaden and shipped worldwide; lead time seems to be a few weeks. The basic product is a portfolio composed of a leather or leather-like “originally designed for ballet dance floors” exterior material sewn to a thick felt inner lining. You can choose among many different colors. I went with orange and black, which, because they are the colors of the standard Rhodia notebooks, are synonymous in my mind with getting one’s shit together (immerscheißezusammen).
Looks like an interesting, if expensive, product I was not otherwise familiar with.