Little to no use on the system (bag and battery), but shirts have been worn - one large one a number of times, and then the other 2 maybe once or twice. This system can be installed in a track or race car without having to tie into the electricity of the car and will cool the driver down. Can be used anywhere you’d like - just add ice, water, charge the battery, then ready to go - cold water will pump through the shirt. Shirt sizes and condition depicted in photos. No returns.