Vacuum Cleaners Discussions

I was looking over everyone's posts and didn't seem to see many recommendations for backpack vacs. My wife Jenny and I both work long hours and come home to clean up but our of fear of straining ourselves further by leaning over have found ourselves hesistant to touch our stand-up vac. Any one have any suggestions? (We've only briefly looked into our options).
Thanks,
Roger

RHalfax, from your post, I understand that the main reason for your considering a backpack vac, is to avoid strain caused by leaning over. But these days, you do get advanced models of both upright and canister vacuums which do not require bending over as they have all the controls conveniently positioned on the handle and the movements are motorized to cause less strain.