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Corrugated Board Material, ECT Box Style, Strength & Print

When most people think of a traditional box, they often picture a simple container with six panels–two for the top and bottom and four for each side of the box. At the ZIPPY BOXES, we’re here to show you just how many different types of corrugated boxes there really are. You will see cardboard box styles including the common Regular Slotted Containers, Telescope Design Boxes, Full Overlap Containers, and so much more. The box shape can be designed by our packaging designers or created to your specifications. What is important is that the product fits inside the box seamlessly. For custom made boxes we provide two base color Kraft (brown) and white. For printing we use the standard Pantone colors to provide the most accurate color matching for logos, graphics and other images you provide us.


A corrugated box consists of two components – liner and medium, these determine the strength of the box. The liners are made up of linerboard the flat sheets that are seen on both the inside and outside of a cardboard box. The medium is made up of fluted paper—the wavy center—that is sandwiched between the two sheets of liner. When glued to the liner, the flute becomes durable and can support tremendous amounts of weight.

The medium and linerboard can be combined in several combinations depending on the needs of the customer and the purpose of the box.

Single-Wall: It is also called 3-ply board. The medium is between two sheets of linerboard.

Double-Wall: It is also called 5 ply board. Two mediums between three sheets of linerboard.

ZIPPY BOXES adhere to the new standard of measuring a box's strength - the Edge Crush Test (ECT). The ECT is a measure of the edgewise-compressive strength of a corrugated cardboard box. The ECT test is universally applicable because it is a good measure of the stacking strength of a given box design. The calculation is measured in pounds per lineal inch of load-bearing edge (lb/in) but is usually reported as an ECT value (ex. 26 ECT, 32 ECT, 40 ECT & 44 ECT). The strength of the chosen box will also be an important factor to consider when ordering your custom packaging solution.