Bundle Monster Borders Kobo (1st Generation) Ereader Genuine Leather Opening Case Cover Jacket with Interior Compartments - Purple
It is a great fit for the Kobo ereader.  It is easy to put the Kobe into it with the elastic tabs at the top.  It protects the Kobo from dust very effectively.  The interior compartments are a nice size for credit cards or library cards.  Since it is made of leather it is very durable and easy to keep clean.  It is also a nice bright colour.