The legal and social pressure to recycle materials is constantly on the increase. As a result of the
physical characteristics of glass and its large-scale use, the glass-producing sector represents one of
the most important in terms of volume when implementing reverse logistics practices. This article
studies the relationships with suppliers and customers from the perspective of environmental
demands on the part of the packaging and bottling companies that use this material. The study
compares the results obtained in two European countries, Spain and Belgium, which present very
different characteristics as regards consumer habits and recycling.