To follow up on OM's comment-- my parka is designed for deep winter and high altitude climbing. The shell is Goretex; the newer version is made from Pertex and Hyvent. This jacket weighs more than 3 pounds (around 52 oz. or so.), but the shell is made for hard use.

On the other hand, I have another down jacket made of ripstop and a lightweight down vest with a very light shell, neither of which have a very durable outer shell. The point being, evaluate what you going to buy based on your needs and the specs. That will save you a lot of aggravation and probably some money.
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Don't get me started, you know how I get.