Was gona start a thread about bags too, but since you already started I'll continue from here.
Which bag would u guys recommend
Equipment : DSLR+battery pack with short zoom (under 5" lenght), flash & maybe a 2nd lens). Extra batteries, filters & other stuff can be stored in other bags.
Condition : rough conditions, waterproof if possible otherwise resistant.
Bag type : either backpack or belt/waist.
Cost : the usual cheap+fresh+2yr warranty (translate on your own)