Advice for bag for Canon 550d with 70-300 mm lens attached

[Simps]

Hi

I am looking for a bag to carry my Canon 550d with a Canon 70-300 mm lens attached. I also want room to carry the standard kit lens. I do not want a bag which is of laptop size.
I have looked at Lowpro Nova 170 AW on the internet but think it is probably too small. I would like a similar type of bag which is preferably weatherproof. Please can anybody recommend one?

 

[modchild]

I've got a couple of Tamrac bags and have just ordered another one. They are very well made and do a great range of bags from shoulder bags to rucksacks. Well worth a browse through the range, I'm sure there'll be something suitable in there.