The BP 350 is more sustainable than its predecessors, and made with recycled and solution-dyed fabric which releases less greenhouse gas emissions, and uses less water and chemicals. It also improves the colorfastness of the dye by locking the color into the fibers and producing higher color uniformity.
It's my first camera backpack and I should have stuck with a newer Domke shoulder bag with easier access. Clearly, while wearing the back, the only way to get to change a lens is to remove the pack and put it down. Silly me . . . such an oversight!
Otherwise, as a backpack it is durable and handsome.