[Madhatter]

This is interesting. The cans of coke, should be fit for the purpose, and I'd imagine that would also include the can itself. You'd reasonably expect the can to contain the drink in normal circumstances, and not leak. As the store has a carpark for shoppers to use, and people put shoppin in the boot of thier car, it would be reasonable to expect the cans not to explode. If the cans were left in high heat all day, or you'd been driving over rough ground and not a road, then maybe they'd have an excuse, but if not, then they're not fit for the purpose.