How does packaging (glass vs can vs PET) affect the shelf life of premium NA drinks?
Glass is the gold standard for flavour neutrality — it is essentially inert and imparts no flavour compounds to the beverage. However, clear glass offers zero UV protection: UV light at 300–600nm triggers photo-oxidation reactions (particularly in hop-derived compounds, creating 'skunked' beer or light-struck wine), making amber glass effectively mandatory for hop-forward NA beers and still-critical for aromatic NA spirits. Glass closures (cork, crown cap, aluminium screw cap) have different oxygen transmission rates — cork allows slow micro-oxygenation useful in wine but potentially damaging in NA products without alcohol's antioxidant capacity.
Aluminium cans provide excellent UV barrier (complete block) and, when properly seam-sealed, have very low oxygen transmission rates. The critical quality variable is the internal can lining: without a barrier coating, bare aluminium reacts with acids and certain organic compounds, imparting metallic off-notes within weeks. Premium NA brands use epoxy or BPA-free acrylic linings that prevent metal contact. Cans also have the practical advantage of being lightweight and generating less CO2 in transport than glass.
PET (polyethylene terephthalate) has the highest oxygen transmission rate of the three options — approximately 0.0001–0.001 cc·mm/cm²·day·atm depending on thickness and additive package — which is orders of magnitude higher than glass or aluminium. For NA drinks, this means measurable oxidative degradation within 3–6 months even under refrigeration. PET is appropriate for short shelf-life products (kombucha at retail for < 3 months) but inappropriate for premium NA spirits or wines aiming for 12–18 month shelf life.
| Packaging | Oxygen barrier | UV protection | Flavour neutrality | Optimal use |
|---|---|---|---|---|
| Amber glass | Excellent (seals dependent) | Good (amber blocks UV) | Excellent | Premium NA wine, spirits, long-shelf beer |
| Aluminium can (lined) | Excellent | Complete | Good (with lining) | NA beer, RTDs, canned cocktails |
| PET | Poor | Moderate | Moderate (scalping) | Short shelf-life, budget, kombucha RTD |
Packaging formats and their quality implications are discussed in the zeroproof.one NA drinks production and selection guide.