With few exceptions, we generally use open-pored leather. This open-pored nature creates a self-care effect in the leather with use, which is caused by friction, light, and especially by the oil from our hands: the bag acquires a patina, making it a unique, one-of-a-kind piece. The patina effect is more or less pronounced depending on the surface finish. Polished leather (the surface is somewhat more closed due to a type of mechanical smoothing) changes more slowly, while completely open-pored leather exhibits a more intense patina effect. It is important to ensure that the leather does not dry out. This happens especially when the bag is not in use, is exposed to strong sunlight for an extended period, gets hot (e.g., behind a window pane), or is frequently wet or scuffed (rough edges and corners) during use. In these cases, it is advisable to treat it with care.