Depending on your needs and wishes, you can fill the balloon with air or balloon gas. For one balloon, you need around 0.015 m³ of balloon gas. When filled with gas, it has a load capacity of around 2 grams and a flight duration of around 1 to 2 weeks. To fill with air, simply insert a straw or balloon pump into the valve and inflate the balloon. Thanks to the self-closing valve, the balloon can be filled and used several times.