The phrase "special bins" refers to containers or receptacles that are different or unique in some way. They are specifically designed for a particular purpose, such as separating and collecting specific types of waste or recycling materials.
«And there are lots of recycling bins all over the place on Earth» said Poogle proudly showing pictures of special bins of all shapes and sizes. (recyclenow.com)
There's also a special bin that holds smartphones, a 17 - speaker sound system, and a special rear hitch attachment for ski or bike racks. (automobilemag.com)