I soppose there are situations where a bungie cord is just the 'best' choice.. but here are some things to remember.. the black rubber ones are probably a bit safer that the fabric over composite straps' ones.. I've seen the little not in those pull through, or have the stapele come off in bad times. They are also not good at holding loads.. just securing it from slight movement... perhaps a compination of a load bearing device.. like a rope, with a bungie for tension might do better?
just random ideas...
Chris