How do you carry this lens around ? In its own original case or in a Backpack or how ? I need a bag which can take a D2X+17-55, the 300/2.8VR, one other lens probably the 180/2.8 or the 200/4 and a Sb 800. I have a Billingham 445 and a Tamrac 5263 (wheeler) and a Tamrac Velocity 9. All these bags are too small to carry the above equipment. Can some actual users of the 300/2.8VR share their experience and suggest a bag, preferably a BackPack.