That is because when people go to the shops and supermarkets now they prefer to bring their own re-useable bags rather than pay the equivalent of 19p that each plastic bag costs.
For the duration of the Plastiki expedition I urge you to remember your re-useable water bottle, this alone will help to reduce the 200 billion liters of bottled water consumed each year.
The service also supports custom presets (pre-defined settings made by the customer), making it easy for customers to create re-useable transcoding settings for their unique requirements such as a specific video size or bitrate.