Hanging-Up your leather bag in a nice airy environment is always preferable. However if you are short of hanging space you can store it in a warm dry environment by keeping it in its dust bag.
Allow some space for your bag where you store it. Don’t have it rubbing up against other items and give it some space to breath. Make sure it is kept in a warm dry environment. Be wary of damp dark spaces like some closets as this can cause fungus to grow on the leather surface. Store away from direct sunlight. Regular use and handling will always help as the natural oils of your skin and fresh air help with the longevity of the product life span.
ALWAYS Keep Your Bag away From Wetness. If your bag does get wet, wipe it dry and leave it in the natural air in a naturally warm dry space. Water will cause brittleness to the leather if it is left to soak in.
Alternating your bag wearing will add longevity to its life as it gets time to air.
Condition Your Bag every few months with a quality leather conditioner. This will hydrate your bag and add massively to the life cycle of your product and keep it looking in great condition. In fact quality leather is one of the few items you will purchase that actually looks and feels better with age. Often your leather bag will gain a patina or light shine from rubbing against your clothing as you wear it enhancing the natural beauty of the product