Plastics are used in a number of applications on a daily basis. Yet some plastic items end up in the waste stream after a single use only (single-life or cycle) or a short time after purchase, e.g. food packaging. Re-using plastic is preferable to recycling as it uses less energy and fewer resources. In recent years, multi-trip plastics have become a more popular choice leading to PSW reduction in the MSW final stream. In the UK, recyclable and returnable plastic crates used in transport and other purposes, have quadrupled from 1992 (8.5 million tonnes) to 2002 (35.8 million tonnes) (JCR, 2006). Re-using plastics has a number of advantages, characterised by (i) conservation of fossil fuels since plastic production uses 4–8% of global oil production, i.e. 4% as feedstock and 4% during conversion (Perdon, 2004 and JCR, 2006); (ii) reduction of energy and MSW, and (iii) reduction of carbon-dioxide (CO2), nitrogen-oxides (NOx) and sulphur-dioxide (SO2) emissions.