Chickens don't know geometry

It's midnight and I haven't eaten since breakfast. I run down to the 24 hour squat'n shop and get me an 8-piece tub of grocery store fried chicken. Upon my return home, I open the tub and remove 3 pieces of grocery store fried chicken - one juicy leg and both flightless wings. I try to return the tub to it's original closed and secure position, but it won't close. Conclusion: 5 pieces of grocery store fried chicken require greater tub volume than 8 pieces.