The press material says that the camera compartment is big enough to hold a DSLR with two lenses, as well as a flash and accessories. I found that to be true, although it can be a tight squeeze. Here's what I was carrying, which pretty much maxed out the compartment: 1 Canon 7D with a 24-105 F/4L IS (attached), 1 50mm F/1.8 II, 1 Canon 580 EX Flash and a Leica D-Lux 3 camera I was also reviewing. The Velcro dividers are customizable, but the pocket itself isn't that deep (because of the low-profile of the bag) so it took a bit of configuring before I got everything where I wanted it. Once I had it figured out, though, everything stayed nice and secure. But, if you're using a large pro body or a battery grip, you can expect to fit even less gear.