Ballistic and Fabric bags can be hand washed in cold water with mild detergent and hung up to air dry. Many customers wash them on gentle cycle in a front loading washing machine and hang them up to air dry. Don't use any detergents with Oxy or similar stain removing ingredients, they will fade the colors in the fabric.
We recommend Lexol Leather Conditioner to keep your leather bag or backpack looking good after a period of use. It is frequently available at car washes, hardware store, or online. It comes in a spray bottle, just saturate an old cloth and evenly apply it all over the bag to "moisturize" the leather.