Bike + Gear < Hand + Checked in airline baggage allowance

Me before tour ≈ Me after tour + 5 lbs (ymmv)

edit: +1 on having the right sleeping gear for the conditions you'll be in.
Saving weight by carrying a too light sleeping bag, then freezing your ass off every night ain't fun.
A too heavy bag might leave you sweating and being eaten by bugs all night :/
Tarp, hammock or tent choice depends on the conditions as well.

Food and water weigh a lot as well. Fully stocked up I'll have at least 6.6 lbs (3 litres) of water plus maybe as much food again. And fuel...