For me this fits in:
Canon EOS 70D with 18-135mm lens attached and battery grip
Canon 50mm 1.8
Canon 24mm 2.8 (Pancake)
Tamron 16-300mm Super Zoom lens
Tamron 90mm Macro Lens
Tokina 12-24mm
System flash (Metz 50 AF) and color filters
Cleaning Accessories (brush, bellows)
4 Funkauslöser (all have individual conversion for various functions)
Filter bag for 6 Spin
Bean bag for the ground-Knipserei
2 cans of soft drinks (0.33)
and a Culmann Nanomax 430T you get too attached ...
So the thing is busy but not crowded, you can get anywhere easily tuned.