Fill with helium so they float up. Seal tightly with the self seal, and for extra seal use tape or a heat sealer. These last ages.
We currently do not have any helium tanks available, but we recommend purchasing one online or locally. You can even hire a tank in your local area if you are doing quite a few balloon bouquets and foils. You can take our balloons to a reputable outlet to inflate for a fee. Balloons can also be filled with air by using an air-compressor or pump. All of our balloon garlands require air fill only (not helium). Any questions send us an email email@example.com