T-shirt bags, also known as horse clip bags, are a type of common plastic bag that gets its name because of its shape that resembles a vest.

T-shirt bags are simple to make, widely used, and have become an indispensable necessity for people in daily life, providing great convenience for people, but at the same time also causing environmental pollution, for which the country has issued a plastic ban to prohibit the production of T-shirt bags with a single side of 2.5 mm filament or less, in order to limit the amount of T-shirt bags.