As the other post stated, the rear pockets are easy to reach. Basically, they are directly under your jersey pockets.
I use those pockets more than the thigh pockets.

The one bothersome issue with Core cargo bibs are the straps attach too far apart. Pro Team has the straps on the front of your chest.
The cargo core sit off the sides of your torso, so the straps tend to bunch up.

I also went one size down on the Core compared to Pro Team. They are a good value, though I'm probably not going to buy Core again.