A Campingaz 901 bottle is filled with 400 grams of butane. The gas cylinder is filled by an authorized dealer. At HoekVT in stock and available 24/7. The famous blue gas cylinders are available from about 900 grams to just under 2 kilos. The small package and light weight makes them convenient for campers. For the filling, you simply exchange your empty bottle and you pay only the filling.