In the case of Coke, I think the cost of packaging is bigger than the cost of the product, but either way its almost irrelevant to the price - they charge what

In the case of Coke, I think the cost of packaging is bigger than the cost of the product, but either way its almost irrelevant to the price - they charge what people are willing to pay. I wouldn't buy a big bottle from a convenience store, a small bottle is more convenient for walking around with. I wouldn't buy a small bottle from a supermarket, I want a big bottle to put in the fridge at home.