BackSavers are very strong and functional for their intended use.
They were not designed to be handles for lifting a canoe.
It is also possible to break a BackSaver by kneeling/standing on it or throwing a heavy pack on it when it is strapped down against the seat.
Flipping the canoe upside down while the BackSaver is still in its
vertical or back support position can also damage it.
The BackSaver was designed to support your back not the canoe!