The purpose of fitting all the items into the soap dish is only for the challenge of the task. Afterwards its entirely up to the soldier what to put in their Military gear as a PSK. The general rule is "you pack it you hump it” But by the time your TAC vest is filled with mission essential equipment (ammo, grenades, wire cutters etc) you have very little room for much else. The point of the exercise is to be mega confident in the limited items you do decide to take.

When I am bashing about hunting at home my PSK is quite large with a fair amount of comfort items. When at work I have no other choice but to go ULTRA-Light.