[quote name='Gust0o' timestamp='1329986734' post='1550718']
Any risk with the back is a serious one. I'm built like proverbial sh*tehouse, played rugby for years and hit the gym regularly... And slipped a disc doing something totally f***ing innocuous, after not heeding the warning signs.
[/quote]
My story is very similar: Rugby, gym, (and rowing) slipped disc in neck.
I acquired an Overwater padded strap a few years ago that is the widest and most comfortable I've yet found. The amp and cabs are now very easy for me to lump around and aside from the OW all my basses are relatively light. I couldn't tell you exactly what my Precision weighs but I'm sure its around 8lbs.
So don't force yourself to carry things that will damage your skeleton in the medium to long term. It really isn't worth it.