Short answer
Salt, sun and humidity dry leather out and fade it at the same time. Three habits add seasons to a bag's life: never leaving it on a car's back shelf, wiping it with a damp cloth after the beach and drying it in shade, and storing it in a cloth bag rather than a plastic one.
Sun: the fastest way to age leather
Direct sun damages leather from two directions: it fades the colour and drives out the oils that keep the surface supple. Dried leather then cracks. The most common damage we see doesn't come from use at all — it comes from a parked car. One afternoon on the back shelf ages a bag more than six months of carrying it.
The rule is simple: don't leave a bag in the car, and if you must, put it in the boot. At home, keep it in a cupboard rather than on a windowsill.
Salt and sand
When seawater dries, the salt stays on the leather as a pale mark, and over time it draws the moisture out of the fibres. Sand gets into zip teeth and seams, where it works like sandpaper.
- After the beach, wipe the bag with a damp cloth, then go over it with a dry one.
- Dry it in shade. Sun or a hairdryer will stiffen the leather.
- Get sand out by turning the bag upside down and shaking, not by brushing the leather; clean the zip with a dry brush.
- If a salt mark remains: one part white vinegar to one part water. Wet the cloth, wring it out well, pass over the mark, then dry cloth.
Damp, mould and the winter cupboard
Humidity runs high near the coast, and leather that can't breathe in a closed cupboard grows mould. Mould marks usually don't come out, so this is a question of prevention rather than cleaning.
- Never store a bag in a plastic bag. Plastic traps the moisture inside — it is the number one cause of mould.
- Use a cloth dust bag (which is exactly what the one that came with the bag is for).
- Stuff it with paper or a towel to hold the shape. Not newspaper — the ink transfers to the lining.
- Keep a moisture absorber in the corner of the cupboard; it earns its keep over winter.
Ten minutes a month: the routine
- Empty the bag, turn it over and shake out the crumbs and sand.
- Wipe the outside with a damp cloth; clean around the zip and hardware with a dry brush.
- Let it dry in shade.
- If you're using a leather cream or balm, apply a thin layer in circular strokes. Small amount, no long soaking.
- Polish the hardware with a dry cloth — in salt air that's the first thing to oxidise.
- Put it in its cloth bag, close the top, and stand it upright on a shelf.
Suede is a separate matter
Never use a damp cloth on suede; it leaves a water mark. Suede care is dry: a proper suede brush, brushed in one direction. If the surface has gone shiny, brushing lifts the nap back up.
On a new suede piece the most effective single step is a protector spray before first use — it leaves a layer that pushes liquid back before it can stain. Against grease marks, the old method still works: talcum powder overnight, brush in the morning.
Five things never to do
- Drying wet leather with a hairdryer or in the sun — it stiffens and cracks.
- Storing a bag in plastic — the number one cause of mould.
- Wiping suede with a wet cloth — the mark is permanent.
- Using alcohol-based wipes — they lift the colour.
- Hanging a full bag by its strap — the strap seams open over time. Stand it on a shelf.