I would say yes. My D300S with a lens attached fit. The dimensions b/w both cameras D7000 and D300 are similar. The divider inside the big bottom compartment meant for the camera with lens is with velcrow attachments that can be adjusted for a better fit.
Ron, Did you go with this bag and did your D7000 with 70-300mm ATTACHED fit in the bag? If not, did you find a bag that it does fit? Looking for the same thing myself, you could be a great help with a reply. Thank you!