Brand owners choosing a beverage container weigh four things: protection, cost, sustainability and shelf appeal. PET, glass and aluminium each win on different axes. Here is an honest, like-for-like comparison — not a sales pitch.
At a glance
| Property | PET | Glass | Aluminium |
|---|---|---|---|
| Weight (500 ml) | Lightest (~10–20 g) | Heaviest (~200–300 g) | Light (~13 g can) |
| Breakage | Unbreakable | Shatters | Dents, no shatter |
| Clarity | Clear | Clear | Opaque |
| Gas barrier (O₂/CO₂) | Good — boostable | Absolute | Excellent |
| Cost per filled unit | Lowest | Higher | Higher |
| Recyclability | Food-grade rPET | Indefinite | Indefinite, high scrap value |
| Resealable | Yes (cap) | Yes (cap) | Cans no; bottle-cans yes |
| Best for | Water, CSD, oil, juice, on-the-go | Premium, spirits, long shelf life | Beer, energy, chilled single-serve |
Weight and transport
PET is by far the lightest — a 500 ml PET bottle weighs roughly 10–20 g versus 200–300 g for the same bottle in glass. Lighter packs cut freight cost and transport carbon, which matters most over long export distances. Aluminium cans are light too.
Protection and barrier
Glass is an absolute barrier — nothing passes through it — and aluminium is excellent, so both suit very oxygen- or light-sensitive products. PET is a good but not perfect barrier; for long-shelf-life juice, beer or oxygen-sensitive drinks it can be boosted with a barrier layer or scavenger (see the barrier & shelf-life guide). For water, CSD, edible oil and most ambient drinks, standard PET is more than adequate.
Breakage and safety
PET is effectively unbreakable and safe around children, pools and transport; glass shatters. That is why water, sports and on-the-go formats overwhelmingly use PET.
Cost
PET is usually the lowest cost per filled unit — it is light, blows on-site from a small preform, and ships cheaply as preforms rather than empty bottles. Glass and aluminium generally cost more per unit and far more to ship empty.
Sustainability — compare on a full life cycle
All three are recyclable. Glass and aluminium are recycled to like material indefinitely, and aluminium has the highest scrap value and recycling rate. PET recycles into food-grade rPET (see the rPET buyer guide) and, because it is so light, often carries the lowest transport carbon. Real outcomes depend on recycled content, collection rate and shipping distance — so compare on a full LCA, not on the material name alone.
How to choose
- Water, CSD, sports, edible oil, value beverages, anything that travels → PET: light, shatterproof, low cost, recyclable.
- Premium spirits, some beer, very long shelf life, premium shelf image → glass.
- Beer, energy and chilled single-serve where barrier and fast chilling matter → aluminium.
For PET, Delta El Nile for Industry supplies preforms from 9 g water to 5-gallon returnable — compare the range or build an RFQ.