I love notebooks with a zipped pocket for storing things. Here are some examples of notebooks that come with a zipped pocket (or with zipped inserts):

• The Storage.It Range from Mark’s
• Midori Traveler’s Notebook – Zip Pocket Insert
• Levenger
• M by Staples (ARC)

How do you store loose paper? Tuck it inside your notebook, the back pocket, a zipped pocket or use the elastic strap?