If you are using these like a banner or stuck to a wall you could ...
We used these for our wedding in the park to mark the location for guest.  Absolutely huge and just what we wanted.  It cost $1.25 each at our local dollar store to fill with helium so they would float.  If you are using these like a banner or stuck to a wall you could use air from bicycle pump,  it would take entirely to long to blow up by mouth.
Rating: 5 stars