The Shoulder Dolly supposedly helps you move heavy objects by supporting them on your shoulders, taking the stress off your back. One possible downside: if your partners slips going down the stairs, you, him, and that refrigerator are all going down together.
Two versions of the Shoulder Dolly are available: one is a more heavy duty “pro” version with thicker nylon straps and metal lifting hardware, ringing up at around $300. The more reasonably priced “light-duty” version features a claimed capacity of 400 pounds and is constructed of nylon.
On either version, the straps loop over your shoulders and the lifting strap slips under the object you want to move. You get to stay upright, and the lifting is done by your legs and shoulders — as opposed to your lower back and arms.
The light duty version can be found for about $40.