Can or bottle - does beer really taste different
Can or bottle? It is one of the oldest and most heated disputes among beer lovers. Many people are deeply convinced that beer in a bottle is better, nobler, and that a can is the package of a cheaper, worse drink that, on top of it, tastes of metal. Others swear by the can. Who is right? The answer may surprise you, because science and brewing practice here contradict the popular belief. Let us break this dispute down to first principles, check what really happens to beer in both packages, and bust a few myths that have survived decades. Because the truth is more interesting than you think.
Where the myth of glass superiority came from
Let us start at the source of the whole dispute, because it is the key to understanding. The belief that a bottle means better beer comes not from facts but from marketing of decades ago. When cans entered the market, they were associated with cheap, mass beer, so producers of premium brands deliberately built the image of the bottle as a symbol of quality, to set themselves apart from the competition. This association - bottle equals class, can equals trash - became embedded in culture and survived to this day, even though it long ago lost its connection to reality. Modern technology has completely reversed the situation, but the prejudice remains. Many people to this day unconsciously choose the worse package, guided by a myth rather than knowledge. It is time to set this straight.
Light - here the can wins
The first objective factor in which the packages differ is protection from light. And here the can wins outright. Aluminium is completely impervious to light, so beer in a can is one hundred percent protected from the radiation that causes skunking - that unpleasant, sulphurous smell. A bottle protects worse, and the outcome depends on the colour of the glass: brown gives decent protection, but green and clear let through a lot of light, exposing the beer to skunking even within minutes in the sun. We wrote about this in our piece on beer going off. On the question of light there is no debate: the can is the best possible package, and the clear bottle the worst. It is a measurable, scientific fact.
Oxygen - the can leads again
The second key factor is protection from oxygen, which oxidises beer and gives, over time, cardboardy, papery notes. Here too the can has the advantage, though smaller than before. The seal of a can is tighter than a cap on a bottle, so it cuts off oxygen access better, which extends the freshness of the beer. It must honestly be added, though, that modern bottling lines have improved greatly and the difference in the amount of oxygen packed with the beer is today far smaller than it once was. Even so, the can still has a slight edge in tightness. Combined with perfect light protection, this gives the can the status of the package that best keeps beer in optimal form. For freshness, the can is simply the safer choice.
The myth of the metallic aftertaste
The most common charge against cans is the supposed metallic aftertaste that aluminium is meant to cast on the beer. This, however, is mainly a myth. Modern cans are coated on the inside with a thin, neutral protective layer that completely separates the beer from the metal - the drink never touches the aluminium directly. So where does the impression of metal come from? From two sources. First, from drinking straight from the can, when the nose senses the smell of the metal rim and transfers that impression to the taste. Second, metallic notes can be a real flaw of the beer arising in the brewing process, independent of the package. The solution to the first problem is trivial: pour the beer into a glass. Then you will sense no metal, because there is none. It is prejudice, not taste.
Drinking straight from the package
Here we come to a thing that has far more influence on flavour than the choice of can or bottle: whether you pour the beer into a glass at all. Drinking straight from the can or the bottle, regardless of the package, cuts the nose off from the beer. And since most of what we call flavour is in fact aroma sensed through smell, drinking from the package loses you half the experience. On top of that you do not see the colour or the head. That is why you should always pour good beer into a glass and let it build a head that carries the aroma. This one decision does more for the flavour than the whole dispute about packaging. Can or bottle, what matters is that the beer reaches the right vessel, not straight into the mouth.
When the bottle has the advantage
For balance, let us show where the bottle really is sometimes better, because it is not without merits. First, some bottle-conditioned beer styles, that is maturing with live yeast inside, like many Belgian beers or strong beers for cellaring, traditionally go into bottles, and this package favours their long maturation. Second, studies show that for some styles the outcome can differ - for example the fruity aroma of certain ales held longer in a bottle, while IPA held longer in a can. Third, the bottle has aesthetic and ceremonial value, which matters with pricier, collectible beers. So it is not the case that a bottle is always worse - its advantages simply lie elsewhere than in pure freshness.
What about draught beer
In this dispute we cannot leave out a third contender: draught beer, that is from the keg. Many consider it the best, and they are often right, but for a specific reason. Beer from a good, clean tap can be the freshest, because the keg empties quickly and the beer has not had time to age. It also goes straight into the glass, with the right head. But all this depends on one condition: the cleanliness and servicing of the system. A neglected, dirty tap can ruin even the best beer, giving it a stale, sour aftertaste. That is why good canned beer poured into a clean glass can be better than beer from a neglected tap. Freshness and hygiene matter more than the source itself. The form of serving is not everything.
What really matters
Let us set aside the dispute about packaging and ask what really decides whether beer tastes good. First, freshness - young beer almost always beats older, regardless of package. Second, the storage conditions - cool and dark, which are easier to ensure with beer in a can. Third, pouring into a clean, grease-free glass and the right serving temperature. Fourth, the quality of the beer and the brewery itself. All these factors have a far greater influence on flavour than whether the drink arrived in aluminium or glass. The can versus bottle dispute is essentially an argument about something secondary, while the real secrets of good beer lie quite elsewhere. It is worth focusing your energy on what really works.
The verdict
Time for an honest summary of the dispute. In terms of pure quality and preservation of beer freshness, the can today has a slight but real advantage: it protects better from light and oxygen, and the metallic aftertaste is a myth solved by pouring into a glass. The bottle is not worse in everything - it shines with conditioned, collectible beers and where aesthetics or long maturation matter. But the belief that a bottle means better beer is a relic of marketing, not a fact. The most important thing happens outside this dispute anyway: buy fresh beer, keep it cool and dark and always pour it into a glass. Do that, and the package will cease to matter. It is not the can or the bottle that decides your pleasure, but you.
Next time compare the same beer from a can and from a bottle, both poured into a glass, and note your impressions in GustoNote. You will check for yourself whether, in a blind test, you can sense any difference at all.