Shoot, I must be doing something wrong here.
Just yesterday I took 2 DSLR's, along with a total of 5 lenses, a light weight tripod, and a flash along with me on a mountain bike ride.
And that's with a bad back
2 of those lenses aren't a lightweight either, being a Sigma 135 - 400, and a Sigma 24 - 70 f2.8
I guess the difference is I wanted the best quality images possible. Which I got

I fully intend upon selling my work, or at least using it in my portfolio.