The phrase "which bin is it" typically refers to identifying the correct bin for disposing of specific types of waste or recycling. The exact bin to use depends on local waste management rules and the materials you want to dispose of. For example, in Guernsey:

• Blue Bag: for tins, cans, plastic bottles, pots, tubs, trays, foil, milk and juice cartons
• Clear Bag: for paper and cardboard
• Reusable Glass Bag: for bottles and jars of any color (excluding Pyrex dishes or drinking glasses)
• General refuse: black bags for general rubbish
• Food waste: in sealable kerbside caddy

Using the correct color bag/bin helps ensure the materials are properly collected and recycled or processed.

If you want to know specifically which bin to use for a certain item or on a particular collection day, you typically need your local authority or council's bin collection schedule or lookup tool, often accessible with your postcode or address. Different councils and regions have distinct arrangements for bins and collections.

In summary, "which bin is it" depends on your local waste management scheme, the type of waste you have, and the collection schedule. For precise identification, check your local council’s bin collection guide or webpage by entering your address or postcode to confirm which bin to use on your collection day. In Guernsey, for example, specific color-coded bags indicate which bin the waste goes into.