Design Sojourn, a small agency in Singapore, developed this handy notebook that expands to contain your biggest ideas. Notebooks can be ordered for $13 plus shipping. UPDATE: Click on the red tab that says “Buy SpacesForIdeas” to order.
The Spaces for Ideas Expandable Sketchbook is perfect for cataloging and documenting your “big” ideas. The Sketchbook comes in a very portable A6 size (14.8cm high and 12.5cm wide including the spine) and each of its 5 pages expands into a generous A3 size. The design of the sketchbook is kept intentionally minimal and clean, so that you can assign each sketchbook to a single project or activity.