Take your top off
Christchurch

Please remove your tops before placing empty bottles into the Yellow Bin.

All lids go into the red bin please!
In most cases, the material used for a plastic bottle is not the same as the lid. 

If we take a shampoo bottle as an example, the bottle itself may be HDPE or PET and the lid Polypropylene (PP).

With the lid still attached, it's harder to compress the bottle as the air is prevented from escaping.  Also, before the bottle can be recycled, the lid needs to be removed. It is important to remove lids from glass bottles also.