CamelBak Reservoir Cleaning Brush Kit. This kit is for cleaning hydration packs and tubes used for hiking and cycling. I bought it new at Montbell several years ago, but it's unused. The staples on the left side of the package have come undone, so it's not strictly unopened. The outer bag has aged. I will fold it as shown in the second picture for shipping. CamelBak Hydration Reservoir Cleaning Maintenance Brush