Bio-digesters may produce more biogas than needed for daily family use i.e. cooking and lighting. When a distribution network is lacking, this surplus gas is either discharged into the air or flared off. This is a waste of valuable renewable energy and a harmful contribution to global warming! But how to store it instead? Portable gasbags offer a cheap and easy to handle solution. The bag (as shown) contains 2 cubic meters of biogas, enough for 4 hours household cooking. With the bags comes the opportunity to sell the gas to families without a bio-digester; so they can cook clean also.