Abstract: The hydration pack apparatus for a bicyclist herein described includes a hydration fluid container that is removably mounted to a bicycle. Hydration fluid is transported from the container to the bicyclist via a flexible tube with one end connecting to an outlet on the container and the other end terminating at a bite actuated valve. The tube is routed on and mounted to the bicycle in a novel fashion. The cyclist, with the brief use of one hand, is able to easily access the bite valve and tube to retrieve hydration while continuing to ride the bicycle and maintaining a neutral and ergonomic posture. Retracting reel assemblies are used to automatically return and hold the tube in a stored position on the bicycle while not in use. The hydration pack can be equipped with additional features allowing for convenient storage and retrieval of nutrition supplements and for secure storage of other accessory items commonly employed by bicyclists.