You'll see Google AdSense adverts on Bookbag, as you do on many sites. These are generated by Google using your general surfing habits.
The Bookbag is a participant in the Amazon EU Associates Programme, an affiliate advertising programme designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.co.uk.
The Bookbag is a participant in the Amazon Europe S.à r.l. Associates Programme, an affiliate advertising programme designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.co.uk/Javari.co.uk/Amazon.de/Amazon.fr/Javari.fr/Amazon.it.