Their primary function is to keep trash in one place until removed. However, there are tons of others. Keep reading below to find out the rest. One of the most important reasons why waste containers first came into being was to prevent the spread of diseases that emerged from places where trash was thrown.The main role plastic dustbins is to keep filthy and decomposing garbage in one place away from the rest of the surrounding environment. Furthermore, using plastic dustbins is an efficient way to reduce and recycle garbage. Plastic dustbins are quite beneficial in tackling the issue of garbage disposal.