Plastic plant bags cost less to produce (and therefore cost less for you) than plastic or metal pots, or other rigid containers.
Grow bags are made of 100% Virgin material, which have small holes in them to allow the free circulation of air. This free circulation of air benefits the roots by allowing them to more efficiently absorb water and nutrients from the soil.
These bags are used to cultivate and grow seedlings into plants or various different fruit and vegetables, depending on the type of seed used.