just for peace of mind, i prefer not to use elastic bands.
u can get plastic attach pieces, kinda like they use in irak as handcuffs.
u might see them in electronice packaging and they are almost like a belt and fasten to themselves and either need to be pulled apar hard o release or be cut away.
they are really cheap, i can get them from my smallest lfs and i think they are most often used for heater holders or something. go to ur lfs and describe what u want and i am sure they will recomment the plastic binder thingies.
sorry if i have not described them very well but dont worry, they are easy to get.