That's because the product is defined by its iconic packaging, a No. 1 size steel can that contains the same amount of condensed tomato soup as it did when the product was first introduced to the public in the late 1800s.
This relative stability in packaging however means Campbell Soup cannot hide the price increases is passes along to its customers through shrinkflation, which many other food producers exploit by keeping the same prices on their goods, but diminishing the amount of goods within them. When inflation drives up the costs of what they have to pay to make and transport their goods to consumers, Campbell's must increase their prices to compensate.
That's what's happening now. Campbell Soup has confirmed it is increasing prices across its product lines:
Get ready to add a few dollars to your monthly canned soup budget, because thanks to rising supply chain costs, Campbell's is planning to raise its prices. On Wednesday, Campbell's announced its last-quarter earnings were weaker than the company had expected. Compared to the same time period last year, profits had fallen 5% to $160 million.