Plastic bottle tops that come on single use plastic bottles are made from PP (plastic 5) or HDPE (plastic 2). PP being the most common material for bottle tops is not commonly recycled. Most household recycling centres will ask you to remove the top before recycling meaning that it ends up in landfill....Another small piece of plastic potentially entering the ocean.

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There is a lot of confusion about the recycling of bottle tops, many companies claim that their caps are recycle-able and it's best to leave them screwed on. Honestly, it completely depends on the facility they end up at. They have a completely different melting point to the bottle PET (plastic number 1) and it comes down to the cost of recycling two different componants.