I can fit my Nikon D5200 plus 2 lenses, small Nikon flash and my extra battery in it. I don't think I could fit anything else in it in all honesty. It's basically two sections. The bottom is the padded camera compartment which is about the size of your typical camera bag. The top is great for storage such as a notebook, a tshirt, or whatever else you could put in a normal backpack.
I have a Nikon d 3200 with an 18-55mm and a 55-200. I can fit my camera with lens attached and my 55-200 in the bag with some room left. Full disclosure getting in the bag on the fly is a pain, good for travel on flight and stuff.
Thanks for your question!
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I hope this helps!