A typical list might end up something like: "I packed my bag and in it I put a book, a toothbrush, a towel, swimming costume, flip-flops, a map, t-shirts, a tent, a bicycle, my pet mouse Herman, a bar of chocolate." Objects do not have to be sensible to be packed in this bag!
A common variation of the game is that the items listed must be in alphabetical order, so the first person would need to choose an object beginning with A, the second person's object would begin with B, an so on.
Other variations involve using a scenario other than packing the bag. For example, "I went to the zoo and saw..." following the same rules as either of the above variants.