Couple thoughts- carrying a multi tool is not an admission that you've failed to adequately prepare your bike before a ride. Also, the weight (even for the bigger ones) is negligible. If you're racing, you wouldn't have a tool or a flat kit, but just riding around... I think carrying one is a no-brainer.
I sometimes like to tinker with my saddle using the hex head on my tool, and having a phillips head allowed me to adjust my limit screws recently after my shift cable snapped so I could force the bike into an easier gear to get home. Sure, I'd have survived without it, but I have the space in my little bag so why not bring it?
Last edited by Dan333SP; 07-18-16 at 03:13 PM.