A gas storage system includes a tank, having a tank gas outlet, and a multitude of gas emitting entities encapsulated by the tank. The gas emitting entities are arranged for providing a gas volume, which when released from the gas emitting entities, is considerably larger than a volume of the gas emitting entities themselves. The gas emitting entities are freely contained in the tank. There are no gas conduits or electrical connections to the tank which has a sealable opening suitable for removal or insertion of the gas emitting entities. The latter have a respective gas release device, which is operable as a response on a stimulation signal. A volume surrounding the gas emitting entities inside the tank is the sole fluid connection between an opening of the gas release device and the tank gas outlet. Methods for storing and releasing gas are also presented.