A Bag is a convenient receptacle for anything wished to be secreted and usually carried by people of doubtful character.
The Box is modern man's obsession. They are born, then put in a box; they go home to live in a box; they study by ticking boxes; they go to what is called “work” in a box, where they sit in their cubicle box; they drive to the grocery store in a box to buy food in a box; they go to the gym in a box to sit in a box; they talk about thinking “outside the box”; and when they die they are put in a box. All boxes, Euclidian, geometrically smooth boxes.
A Burden is attitude-dependent — it's not the load that breaks you down, it's the way you carry it.
30 concepts in this pillow book.