Leather needs to breathe. Just like skin,leather needs some ventilation to prevent mildew and rot. Air can naturally pass through leather, leaving moisture to evaporate naturally. That cant happen when your leather is all sealed up, though. So don't ever store or transport it in plastic. Always use the storage bag the item came with, or some breathable fabric, pillow cases are great for bags and other accessories to be stored in.
Keep leather away from direct sunlight/heat. If your leather product gets wet, leave it to dry naturally. Drying to quickly can cause shrinkage. Leather will fade naturally over time. Avoid leaving in direct sunlight.
A good recommendation for bags and wallets to keep them in top condition is to condition them around every six months.
Zorbel leather conditioner is a superior leather conditioner with a rich blend of natural waxes and lanolin.
Protects, cleans, polishes and preserves smooth leather.