What fundamental change does the pyramid or sachet tea bag shape introduce?

Answer

Significantly more volume inside the pouch

The most defining characteristic of the pyramid tea bag is its inherent three-dimensional structure, which provides significantly more internal volume compared to the severely restricted space found in a traditional flat paper pouch. This extra room is critical because it allows the dried tea leaves adequate space to absorb hot water and fully expand or 'unfurl' during the infusion process. This ability to expand is directly linked to achieving a higher quality brew.

What fundamental change does the pyramid or sachet tea bag shape introduce?
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