You'll never be like Yehuda Moon if you don't have a spare road flare!

Personally, I think "too heavy" is just dependent on whether or not you have to lift the bicycle and carry it. I have to carry my bike up and down a 40cm high staircase each time I take it out for a ride. Since that's absolutely trivial, the rest is gravy.

My bicycle is approximately 40lbs with accessories. The weight of the accessories is well worth the utility they provide to me.

I even have some spare road flares in a box around here somewhere..