Get the 7. Just got myself one.
Expensive but stunning. Mine fits my 5D3 in with attached 70-300L (inc reversed hood), 24-105 and also my new Sigma 35mm 1.4. The large front pocket will hold filters and adapters, then other inner pockets will hold the spares like cleaning bits, spare battery etc. There will even be space for a small beans bag.
Buy bigger than the 5, you dont want to run out of space. The 7 is also much smaller in real life than I thought it would be. Pinestone finish and the general quality of the bag are excellent.
Got mine from Morris last week, delivered within a fewdays .