Drinking system for bike backpacks made from FDA-approved, hygienic polyurethane that can be stretched up to eight times its surface area without tearing. The large, continuous opening with a sliding closure allows for easy filling and cleaning of the hydration bladder. An extra-long, tasteless drinking tube with a 135-degree bite valve is multilayered and therefore completely kink-resistant. The plug-and-play connection to the hydration bladder allows the tube to be easily connected with the push of a button. The internal safety valve prevents leakage from the hydration bladder when the tube is not connected. The attachment in the backpack is done using fastening hooks. Compatible with all Ergon bike backpacks.