As pages and embellishments are added, overall thickness increases. This changes how tension is distributed along the spine or closure. Materials that allow adjustment help accommodate this change more easily.

Why Bindings and Closures Change Over Time
Exposed Bindings: Where Cord Works Well and Where It Causes Problems
Wrap Closures and Adjustable Ties
Managing Bulk at Spines and Edges
When to Use Thread Instead of Cord
Materials That Work Well for Bindings and Closures
Increased resistance when opening pages

