[nichpr]

Have you thought about using a vest. Most have pockets large enough to carry an extra lens and enough pockets to carry anything else you can imagine. Most importantly to me is the fact that wearing a vest is so much easier - I never feel the straps cutting into my shoulders - the weight seems to be so much better distributed.

My bag, if it leaves the house at all, never goes into the field with me anymore since I started using the vest.