Reason I ask this is because I'm trying to keep my bike as light as originally purchased as possible. I've already since added a water bottle (single cuz I can refill along most routes I ride) and getting ready to start carrying mini pump, patches, tools, etc. as I start riding solo).
I ride with a guy who has a full-on Specialized S-works roadie that weighs a feather, yet he's got seat-post bag, stem bag, 2 water bottles, pump, etc. He's probably added 25% to his overall bike weight with just the crap he carries. Why not save a few thousand bucks & just buy an alum middle-budget bike then??
So thinking outloud, I figure I should TRY to carry as much on my person as I can vs on the bike (i.e. don't mount the pump or tools in a stem bag, etc.) since I can probably fluctuate a few pounds in water weight on a long ride, right??
2lbs off the bike is like 10%.
2lbs off my body is like 1%