After every ride, you are supposed to clean and dry the reservoir of your hydration pack. If your pack uses a Camelbak Crux-reservoir you may have found it difficult to dry effectively. In fact, it seems that even Camelbak is aware of this since a hook and a plastic piece for keeping the pack open while drying is included in their Crux-reservoir cleaning kit. The price is a bit high at 20$ for just a few pieces of plastic, two brushes and a couple of cleaning tabs. Since the parts are very simple, you can do your own cleaning kit with minimal tools in less than an hour! Blueprints available!