In terms of pocket capacity, you should be able to fill the central cavity with kit and still have plenty of room in the boots pocket (the big one at the front on the bottom) and the front middle pocket (for toiletries etc). If you stuff the central cavity so full of kit that you are having to squeeze stuff in, then you will reduce the capacity of the other front pockets. You will know if you are overfilling it if you can't push your bats into the bat compartments.