Serving
Beer packaging
Packaging is not branding. The container decides how much light and oxygen reach the beer, and those two things account for most of what goes wrong between the brewery and the glass.
The two variables that matter
Light drives lightstrike: ultraviolet and short-wavelength visible light break down hop-derived iso-alpha-acids into a compound almost identical to the one skunks use defensively. It happens in minutes of direct sun, not months. Brown glass absorbs most of the responsible wavelengths; green and clear glass largely do not.
Oxygen drives staling: it degrades hop aroma first and then produces the cardboard, sherry and wet-paper notes of an oxidised beer. Ingress happens through closures and, in bottles, through the headspace left at filling.
Neither makes a format universally better. A cask is deliberately exposed to air because the beer is meant to be drunk within days; that is a design decision, not a defect.
Formats compared
| Format | Light protection | Oxygen ingress | Conditions in package |
|---|---|---|---|
| Aluminium can | complete — Blocks light entirely. | very low | No |
| Brown glass bottle | good — Blocks most of the wavelengths that cause lightstrike. | low | Yes |
| Cask | complete — Blocks light entirely. | high | Yes |
| Clear glass bottle | none — No protection at all. | low | Yes |
| Green glass bottle | poor — Transmits much of the damaging spectrum. | low | Yes |
| Keg | complete — Blocks light entirely. | very low | No |
| Mini keg | complete — Blocks light entirely. | low | No |
Every format
- Aluminium can
The best mainstream package for beer quality: completely lightproof, very low oxygen ingress, and quick to chill.
- Brown glass bottle
Brown glass blocks most of the wavelengths that cause lightstrike, making it the only glass colour genuinely suited to beer.
- Cask
A vented container in which beer finishes fermenting and from which it is served — a live product with a working life of days.
- Clear glass bottle
Offers no protection at all against lightstrike — beer in clear glass can skunk within minutes of direct sunlight.
- Green glass bottle
Traditional for several European exports, but it does not block the wavelengths responsible for lightstrike.
- Keg
A sealed pressurised container that keeps beer stable for months, with no air contact during dispense.
- Mini keg
A small sealed container for home use, lightproof but usually needing to be finished within days of opening.
Related
Packaging feeds directly into storage and freshness. For how the beer gets out of the container, see dispense.