For me a Nikon D5100 with 18-55mm lens, a 55-200mm lens, 2 sets of batteries for the external flash and some small accessories are stored in it. But this one is already at capacity.
The Nikon SB-700 I had in his own pocket on shoulder strap attach because he no longer fit in.
For anyone who wants to take his camera on trips, possibly the 18-105 Nikkor lens has it, SB-700 in your pocket, I can only recommend the pocket.
But for larger equipment I advise rather to a bag with more storage space.