What plant-cellulose material, derived from sources like corn starch, is frequently utilized in modern, high-quality pyramid bags?
PLA (Polylactic Acid)
A major shift accompanying the adoption of the pyramid shape was the move towards environmentally conscious and potentially healthier packaging materials. High-quality pyramid sachets often replace older synthetic materials with plant-based alternatives, most notably PLA, or Polylactic Acid. PLA is derived from renewable resources, specifically citing examples like corn starch or sugarcane. Companies highlighting this feature stress that these bags are plant-based, compostable, and biodegradable, directly addressing consumer concerns about ingesting microplastics that might shed from heat-resistant plastic materials historically used in conventional bags.

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What makes a pyramid tea bag unique? | Unilever Food ... - YouTube