It appears that the Yeti are territorial.

Edit:

Forgot to answer Killer Hanson's question.

Yes, use a Camelbak. I use the Mule, comes with a 3L bladder and I fill it.
Energy Bars/Granola Bars
Pump
2 Tubes
Patch Kit
Sidewall Patch Kit
Derailleur Hanger
Tire Levers
Multi-Tool
GMRS for my club rides since we can be a big group.
Cell phone
SRAM PowerLink
Small First Aid Kit
Space Blanket
Spare Camelbak Bite Valve. I once endo'ed and managed to rip off the valve. I didn't notice until a few hundred meters later when I started wondering why I was all wet and it wasn't raining.

I leave the shock pump in the trunk of the car along with a foot pump.

R. Danneskjöld - What is a Cool Tool? The term is too generic and I can't find anything conclusive using Google.