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Water on aniline or unfinished leather will leave marks. Water on pigmented or semi-aniline leather usually beads and wipes off. Waterproofing sprays exist but can darken aniline leather permanently — test on a hidden patch first.
Suede and nubuck need a different approach. Use a soft suede brush in one direction to lift the nap, and a dedicated suede eraser for marks. Never wipe suede with a wet cloth.
Store leather bags in a breathable dust bag, not plastic. Stuff with acid-free paper or a soft cushion to hold shape. Avoid direct sunlight, which fades color and dries out fibers.
Color transfer (light bag picking up indigo from jeans) is a common, often-irreversible problem. Light-colored leather worn against dark denim will eventually show this. This is not a defect — it is a property of porous finishes.
A repair policy matters most when the bag has plated hardware (which can rub off), edge paint (which can chip), or magnetic closures (which can weaken). It matters less for vegetable-tanned full-grain bags that are simple in construction.