We commonly associate cardboard sheets to craft, artwork, and school projects or even to packaging. This simple looking material actually has three different types and each type has its own purpose. First, we have the graphic cardboard which is being commonly used for book covers and binders. The second type is the carton board sheets that are popularly used for product packaging because they are strong and lightweight yet cheap. Lastly, there is the corrugated cardboard sheet which is ideal for heavy duty work such as shipping and long period of storage because of its durability. The first two types are readily available at any supplies stores like Paper and Pen, Staples or Office Depot. But if you are looking for the corrugated type, you will need to place an order for it. Or better yet, try looking for a storage warehouse and ask if you can buy it from them.