My 'Chuck box' is in three parts.
Box 1 is labelled 'Snack Box' and contains the Jetboil, two china mugs (yes, china), a couple of small plates, a small, long, Tupperware container with cutlery in including a small cook's knife, a stainless Cafetiere, a mini chopping board, a small box of different teas, a sealed tin of ground coffee, and, if the missus is with me, a mini thermos with milk in. There's still room for biscuits etc. This box is always in the car when we go out for the day and allows us to brew up and have an excellent cup of coffee wherever we are.
Box 2 is labelled 'Spice Box' and this contains a wide selection of spices - in camp I could cook Indian, Italian, Oriental, and others, with the spices I have. Before setting off I will add a small bottle of oil, garlic, onions, and anything else I feel may need on the trip. This box goes with us if we're camping.
Box 3 is labelled 'Kitchen Box' and is twice the size of the other two - it contains the other cooking gear such as pans and cooking utensils, knives, and a larger chopping board. For a short trip it may also contain our main food ingredients. However, for longer treks food goes in a fourth box (same size as the kitchen box) and the kitchen box will probably have a collapsing washing bowl and other tools in it.
All these boxes are standard Euro sized strong stacking boxes with lids and sealed from rodents. They lock together when stacked and two smaller boxes (1 & 2) will sit on a larger box. This means they can easily be strapped down safely in the Defender. I buy mine from Solent Plastics but there are plenty of other suppliers.