A legacy of a life in bands (apart from tinnitus) is that my left shoulder is permanently 2 inches higher than my right. And that's from years of playing basses that have mostly been on the right side of heavy.
I have no idea what my short lived Fender Precision Special weighed when I played it in the 80's but even as a fit and healthy 30 something my knees used to buckle after 20 mins.
My Lull is 8.5 lbs, Lakland 9.5lbs, Fender J 10lbs, TF750 23lbs, TH500 4lbs and BF SC 21lbs. My accessories case is the heaviest thing I carry these days. I'm thinking of splitting that into 2 smaller and lighter cases.
When you get a bad back you make sure you know the weight of everything.