A shaft bag is a condom, used to describe, in a more degrading way; tool bags, tools and douche's.
You see a guy with sunglasses on, at night, in the club with or without a blowout haircut... Shaft bag. The guy that runs on the beach and checks himself out mid-run... shaft bag.
Someone who is addicted to obtaining money and building wealth. A money addict and fanatic. Breadheads often work more than one full-time job, and some even participate in illicit activities to "obtain the bread".