Short version: loose leaf usually wins on flavour, quality, and plastic content. Tea bags win on speed - and not much else. Let us give you the full picture and you can decide what actually matters to you.
What's actually in a tea bag?
Most everyday tea bags are more often than not filled with "dust" and "fannings" - the broken leftovers from processing whole tea leaves. They brew fast and strong, but a lot of the natural oils that make tea interesting are consequently lost along the way.
What makes loose leaf tea different is that it's made from whole or large-cut leaves that haven't been broken down nearly as much. They therefore hold onto their flavour and aroma for much longer.
Why whole leaves taste different
Tea's flavour comes mostly from oils and aromatic compounds stored inside the leaf. Break the leaf into small, dust-sized pieces and you expose far more surface area, causing those oils to degrade much quicker - sometimes before the bag has even reached your cupboard!
Whole leaves are also allowed to unfurl properly as they brew, giving the water time to draw out flavour gradually rather than all at once. Brew the same tea loose and bagged, side by side, and you'll notice the difference. One is much rounder and more complex, whereas the other is much flatter and one dimensional.
Do tea bags contain plastic?
A lot of the time, yes. And it's not just the see-through pyramid bags. Plenty of standard, paper-look bags use plastic (usually polypropylene) as a heat-seal to hold them together. Pyramid bags tend to go further still, made almost entirely from nylon or PET mesh.
Do tea bags release microplastics?
A famous 2019 study from McGill University found that steeping a single plastic tea bag in boiling water could release several billion microplastic and nanoplastic particles into the cup. More recent research, including a 2024 study from the Autonomous University of Barcelona, found similar results, along with evidence that some of these particles can be taken up by human cells.
Scientists are still discovering what this actually means for our long-term health, with results varying from one tea bag material to another. But it's one of the main reasons why so many people are making the shift from tea bags to loose leaf. Brew loose leaf in a metal or ceramic infuser, where there's no plastic mesh anywhere near your cup, and this question doesn't come up at all.
What about the environment?
Tea bags are single-use by design, and once you account for the sealant, plenty aren't fully recyclable or compostable either. Loose leaf tea, brewed with a reusable infuser, leaves you with much less waste behind.
Is loose leaf actually more expensive?
At first glance, it can appear that way. But because loose leaf re-steeps much better, and because you can control exactly how much you use per cup, it actually gos a lot further than you might think.
Do you need special equipment?
No - and this is probably the biggest misconception keeping people on tea bags. An infuser or strainer works the same way a bag does: scoop, steep, remove. It just takes a few extra seconds.
Brewing loose leaf tea, in three steps:
Scoop your tea into an infuser (roughly one heaped teaspoon per cup - adjust to taste).
Pour water at the right temperature for that tea and steep for the recommended time.
Remove the infuser and enjoy. Good leaves can go again for a second and sometimes third cup.
Every new Postea subscription comes with a free infuser and scoop, so making the switch to loose leaf doesn't mean buying extra kit.
The Bottom Line
If you want the fastest cup, with minimal thought and effort, tea bags will always win on convenience. If flavour, quality, and cutting out unnecessary plastic matters more to you, loose leaf is worth the small adjustment - and it's a much smaller adjustment than most people assume.
Loose Leaf Tea vs Tea Bags: What's the Real Difference?
