Tea Bags vs Loose Leaf
Most standard tea bags are heat-sealed with polypropylene. Loose leaf removes both the plastic and the particles it sheds into the cup.
Tea bags look like paper. Most of them are paper blended with polypropylene, because a purely paper bag cannot be heat-sealed shut. That plastic sits in near-boiling water for three minutes, every cup.
Standard tea bags
- Plastic / use
- 0.05g
- Lifespan
- Single use
- Recyclability
- 0%
- Decomposes
- 200 yr
- +Fast, no equipment
- +Portion controlled
- +Available everywhere
- −Sealed with polypropylene in most brands
- −Mesh bags shed measurable particles at brewing temperature
- −Contaminates a compost heap with plastic residue
Loose leaf + steel infuser
- Plastic / use
- 0g
- Lifespan
- Infuser: 10+ years
- Recyclability
- 95%
- Decomposes
- ,
- +No plastic in the cup
- +Leaves compost cleanly
- +Better leaf, usually cheaper per cup
- −Needs an infuser or pot
- −Slightly more washing up
- −Harder at a desk or on the move
The differences
| Tea bags | Loose leaf | |
|---|---|---|
| Plastic in the bag | ~20-25% polypropylene (mesh bags: 100%) | None |
| Particles released into the cup | Measured in the billions for mesh bags | None |
| Compostable | Only after the plastic degrades, no | Leaves compost fully |
| Leaf quality | Dust and fannings | Whole and broken leaf |
| Cost per cup | ~$0.12 | ~$0.07 |
| Effort | Drop and go | Spoon, steep, empty infuser |
Why one wins
A conventional heat-sealed bag is around 20-25% polypropylene by weight. Premium 'silken' pyramid bags are often entirely nylon or PET, plastic mesh, brewed at 95°C.
Published work on plastic pyramid bags measured billions of micro- and nano-plastic particles released into a single cup at brewing temperature. The health consequences are still being studied; the release itself is measured and reproducible.
Loose leaf with a steel infuser removes the question. The leaves compost, the infuser lasts years, and per-cup cost usually drops because you are not paying for the bag, the tag, the string and the envelope.
Loose leaf also lets you use bigger leaf grades. Bag tea is mostly 'dust and fannings', the fine broken material left over from processing.
