The word "袋子" is formed through a structural combination where the core character 袋, which originally and independently means "bag" or "sack", is combined with the suffix 子. This 子 does not carry its literal meaning of "child" but functions as a nominalizing particle, a common feature in Chinese word formation. When attached to "袋", it creates a more colloquial, everyday noun that still means "bag", often softening the term or making it feel more like a concrete, tangible object. The formation is thus a simple, additive process of root plus suffix.