Already used packages, the first step is to empty all objects and remove dust. If it is a very soft material, turn it from inside to outside, clean with a clean barrel. If it is a surface leather, wipe it inside with wet or non alcohol wipes. If you use natural, unprocessed leather, simply remove it with a dry paper towel.
When the bag is empty and clean, something must be filled to keep it in shape. It is recommended to use some acid free toilet paper, a small pillow or a bubble film. In addition, all hardware accessories including zippers should be wiped.