Tools/Equipment to Bring.

There's really no set answer to that, it depends on a lot of things:

• how intent are you on finishing the ride?
  
• can you call someone for pickup, friend or a cab?
  
• how do you feel about carrying stuff?
  

Some really dislike carrying stuff and will either chance it, or rely on calling for help/pickup if something should happen. Some will happily carry a sizeable pack to be able to finish the ride.

As soon as I'm out of walking distance I always carry:

• one spare tube,
  
• tire levers
  
• pump
  
• self-adhesive patches to deal with a 2nd flat, if needed
  
• a small plier, to help remove any penetrating debris
  
• chain breaker
  
• quick link
  
• spare brake cable
  
• spare shifter cable
  
• a folding multi-tool
  
• Some zip ties, a length of duct tape
  

It all fits in one saddle bag and seems like a reasonable compromise between bulk and self-reliance to me.
Longer rides, I add another tube and spare brake pads.
Maybe even a spare tire.

In by seat bag are:

1. An inner tube
2. A patch kit (regular ol' glue-ons, not self-adhesive; and although not specifically gluons, there are [censored] loads of gluons on the interior volume of my seat bag)
3. 2 tire levers
4. A piece of Tyvek (used as a tire boot for for those occasions when a tire cut is large enough that the inner tube might poke through)
5. A bit of cash or a credit card

In one of my back pockets is a mini-tool.

Tube
Patch kit
Spoke wrench
CO2 inflator
2 tire irons
Park Tool tire boot
Park Tool IB-12 multi-tool

In the jersey: cell phone, micro tire pump and the guy that's pulled my ass out of more hot water than MacGyver...our savior, in whom we trust.

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