They are not filled, you can fill at your local store, or rent a helium tank from your local party store or welding company. You can also air fill it and tape to the wall or attach balloon sticks. Please note that mylar balloons last about 1-2 weeks when inflated, although actual float time varies. I try to send the balloons in the manufacturers sealed packaging, but sometimes they are only available bulk and unwrapped so you are aware.