I could drop it off for you. I fit a 70-200 connected to a D200 with battery grip in the small bag no problem. With a 12-24 and a 28-70 (THE BEAST) in there as well. It has a surprising amount of room.
I’m nearly positive the 70-300 would fit, but I’m not sure what version you have and have never messed with one, but the 70-200 is a BIG lens.