Leather is a natural material, which is subject to surface irregularities and slight colour differences. A genuine leather product may also lose colour when wet. Leather may stretch if the bag is subjected to prolonged stress, for example from sharp objects.
Treat the new bag with a moisture-protecting spray. This will protect the bag from moisture or dirt. Treat the bag regularly with a moisturising conditioner.
Handle your leather bag with clean hands to avoid grease stains. However, if stains do occur, remove them as soon as possible with a cotton cloth. Avoid excessive water, but use a soap suitable for leather, such as Marseille ecological soap.
If your bag gets wet, let it dry in peace and quiet, out of direct sunlight. Once dry, you can treat your bag with a moisturising conditioner. Never rub a wet bag, as rubbing can damage the surface of the leather.