METPET vs PET Coffee Bags: What’s the Real Difference?

People often mix up METPET and PET in coffee packaging. They are related but not the same. PET is a clear, tough plastic. METPET is PET that has a very thin metal layer, usually aluminum. That thin layer changes how well the package blocks oxygen, moisture, and UV light. Those barrier upgrades matter a lot for coffee freshness and shelf life.

Is METPET the same as PET coffee packaging?

No. METPET is a modified version of PET. The metal coating gives METPET a much stronger barrier, while plain PET is clear and durable but not a high barrier by itself. This distinction is key for roasted coffee, which loses flavor and aroma when light and oxygen get in.

Why METPET is used for coffee packaging

Coffee stales quickly when exposed to light and oxygen. METPET helps protect flavor and aroma by adding a better barrier layer to the package. It is also a common and economical choice for high barrier coffee bags. Typical high barrier coffee bags use multiple layers: An outer printed PET layer for graphics A middle metallized layer, often METPET or VMPET, as the primary barrier An inner sealant such as polyethylene to create airtight seals

Key differences between PET and METPET

What this means for roasters

• If visibility is important and moderate protection is enough, PET can work.
• If you need better protection from oxygen, moisture, and UV light to keep coffee fresher longer, choose a laminate with a METPET layer.
• Many high barrier coffee bags combine printed PET on the outside, METPET or VMPET in the middle, and a polyethylene sealant on the inside.

Is PET plastic safe to drink from?

Yes. PET, also known as #1 plastic, is generally recognized as safe for food and drink use and is free of BPA. That said, avoid high heat and long sun exposure, since these conditions can speed up material breakdown and potential leaching. PET bottles are intended for single use and can collect bacteria if they are refilled without proper cleaning.

Quick takeaways

• METPET is PET with a thin metal layer that improves barrier strength.
• PET is clear and durable but not a high barrier on its own.
• For coffee, stronger barriers help hold flavor and aroma longer.
• Many coffee bags use multiple layers that include PET, METPET or VMPET, and a sealant.