After using a hydration pack, it is essential to dry it properly to prevent the growth of mold. Mold thrives in moist environments, so getting rid of any moisture is crucial. Here are some steps you can follow to dry your hydration pack effectively:Empty and clean: First, empty the hydration pack completely by pouring out any remaining water. Remove the reservoir from the backpack if it's removable. Then, wash the reservoir, tube, and mouthpiece with warm water and mild soap.