Traditionally, tea bags are square or rectangular in shape. They are usually made of filter paper, a mixture of wood and plant fibers related to the paper used in milk and coffee filters. The latter is bleached pulp banana hemp, a plantation banana plant that grows mainly in the Philippines and Colombia.

Some bags have a heat-sealable thermoplastic such as PVC or polypropylene as component fibers on the surface of the inner tea bag, making them not fully biodegradable. Some of the newer paper tea bags are round in shape.

Tetrahedral tea bags were introduced by the PG Tips brand in 1997. They are usually made of nylon, earth (PLA mesh made from cornstarch), or silk. Nylon is not biodegradable, so environmentalists prefer silk. PLA, on the other hand, is biodegradable, but not compostable.

Empty tea bags are also available for consumers to fill themselves with tea. These are usually open pockets with long flaps. The bag contains the right amount of leaf tea and the flap is closed into the bag to retain the tea. These tea bags combine the ease of commercially produced tea bags with a wider selection of teas and better quality control of loose leaf teas.

The KITECH machine produces beautiful rectangular and triangular shapes through ultrasonic sealing and cutting technology, and is equipped with dual micro-shaped electronic scales as well as a chain hopper metering device to ensure an accurate production environment.

KITECH itself has developed a tea packaging machine that automatically switches between triangle, back seal and three side seal without switching any molds and stops with one click. It has strong anti-magnetic properties, high power, high sealing efficiency, long running time without burning, and also suitable for sealing different package materials (nylon, non-woven, corn fiber)

Pyramid shape gives enough space to extend the whole leaf. This means you can enjoy the same taste and texture as brewing in a teapot.