While they are marked as a commercial vacuum for home use, a backpack vacuum has also been of interest to me and also many of our friends.
Having the unit on one’s back means it is far more manoeuvrable and also may allow quicker vacuuming times.
I have seen this one by an Australian company:
and it may be worth for Choice to test to see how it stacks up against traditional vacuums. They are also reasonably priced as well.