Why Loose Leaf Wins Every Time
If your idea of a good cup of tea starts with plain tea bags from the grocery store, you are likely missing out on truly superior tea experience.
Leaf Size
The main difference between loose teas and bagged teas is the size of the leaves. That's what effects the resulting cup of tea. Tea leaves contain chemicals and essential oils, which are the basis for the delightful flavour of tea. When the tea leaves are broken up, those oils can evaporate, leaving a dull and tasteless tea. Typical tea bags are filled with the tiniest pieces of broken leaves, called fannings. Loose teas are typically whole leaves or at least large pieces of leaves.
Space Factor
On top of the leaf size, there is also the space factor. Tea leaves need space to swell, expand and unfurl. Good water circulation around the leaves is important, which doesn't typically happen in a cramped little tea bag.
More Variety
Even if you prefer a simple cup of black Keemun, or Assam (which is the major component of most bagged teas), try getting your tea loose instead of in bags. If you enjoy a change now and again, you can get a wide variety of teas in bags, but there are many more to choose from if you shop for loose tea.