accessory for any vehicle each of this small bins, will draw humidity out of your car or R V to keep away damp and mildew.. the dry power goes into the top compartment and miraculously the water is drawn from the air into the cup below, just to be dumped periodically. Anything stored for any length of time benefits from these little trays. the dri air power is easily available. i no longer have my R V or my secondary vehicle that wasn't driven much. and had need of these little baskets cups. they are good for your day to day vehicl also in the winter months when condensation forms on the inside of the windshield.. these basket cup just one, takes care of that