RSC (Regular Slotted Container) boxes are the industry standard for shipping and storage. Designed for strength, efficiency, and easy assembly, these boxes use minimal material while providing reliable protection. Available in a wide variety of stock sizes, they offer a practical and cost-effective solution for packaging products of all types.

Stock RSC Boxes

Bursting “Mullen” Test vs. ECT (Edge Crush Test)

Corrugated boxes are commonly rated using one of two strength tests: Mullen Test or ECT (Edge Crush Test). Both measure the strength of corrugated board, but they evaluate different types of performance.

Mullen Test measures the bursting strength of corrugated board. This test determines how much pressure the board can withstand before it ruptures. Mullen-rated boxes are often preferred when packages may experience rough handling or puncture pressure, such as products with sharp edges or heavy items that could burst through the box.

ECT (Edge Crush Test) measures the stacking strength of corrugated board. It evaluates how much vertical pressure a box can withstand before the edges begin to crush. Because most boxes in shipping and warehousing are stacked on pallets, ECT ratings are widely used today to ensure boxes can support weight during storage and transportation.

While Mullen test ratings were the traditional standard for many years, ECT-rated boxes have become more common in modern shipping environments because they are designed to maximize stacking strength while using less material, often making them a more efficient and cost-effective option.

Choosing the right board strength depends on how the product will be packaged, handled, and shipped.

Corrugated Board Strength Comparison

A table listing various test results with columns for burst testing, minimum ECT rating, board type, and maximum suggested weight per carton. The table includes different test numbers, ECT ratings, wall types, and weight limits in pounds.

Quick note:
Single wall boxes are the most common for general shipping. Double wall boxes provide additional stacking strength and durability and are typically used for heavier products, palletized shipments, or items requiring extra protection.

Not sure which board strength you need? Our team can help evaluate your packaging requirements and recommend the most efficient solution for your product and shipping conditions.

Stock Sizes Listed By Length - Available Board Type is Marked

Stock boxes are called out Length x Width x Height | These are the inside, usable dimensions

Diagram of a chest freezer with dimensions labeled for length, width, and height.

Length: 3” - 12”

A detailed table comparing various tire sizes, including 200T, 32 ECT, Double Wall, and Others, without specific entries filled in.
A detailed chart listing different clothing sizes, including categories like 200T and 32 ECT, with columns for double wall and other features.
A black chart with white text and lines, displaying columns for size, 200T, 32 ECT, Double Wall, and Other.

Length: 13” - 23”

A detailed chart or table listing different clothing sizes with columns for size, 200T, 32 ECT, double wall, and other categories.
Empty hotel room rate sheet with columns for size, 200T, 32 ECT, double wall, and other, filled with black background and white lines.
A large chart with columns labeled in uppercase across the top: SIZE, 200T, 32 ECT, Double Wall, and Other. The chart appears to display data in rows, but the rows are filled with lines, not text, indicating a blank or empty chart.
Blank chart with columns labeled Size, 200T, 32 ECT, Double Wall, and Other, and rows separated by black lines.
A detailed chart with columns titled 'SIZE,' '200T,' '32 ECT,' 'Double Wall,' and 'Other,' containing numerous rows of data, most of which are blank.
A detailed size chart for various clothing styles, including 200T, 32 ECT, Double Wall, and Others, with multiple rows and columns for measurements.
A detailed table with columns labeled Size, 200T, 32 ECT, Double Wall, and Other. The rows are filled with various data entries, but no specific text is legible.
A table comparison with columns labeled 'Size', '200T', '32 ECT', 'Double Wall', and 'Other', with multiple rows of data entries.
A chart with columns for Size, 200T, 32 ECT, Double Wall, and Other, but the rows are empty.
A chart with columns labeled Size, 200T, 32 ECT, Double Wall, and Other, but the rows are empty.
A detailed chart with columns labeled SIZE, 200T, 32 ECT, Double Wall, and Other, with multiple rows of data.
A blank clothing size chart with columns labeled Size, 200T, 32 ECT, Double Wall, Other, and rows for different clothing sizes.

Length: 24” - 46”

A blank size chart with columns labeled SIZE, 200T, 32 ECT, Double Wall, and Other, and rows for data entries.
Table with columns for size, 200T, 32 ECT, Double Wall, and Other, and multiple rows for various specifications.

Need something outside the standard box? We’ve got you covered.

From custom sizes and specialty styles to high-impact printing, we’ll help you build packaging that fits your product—and your brand—perfectly. Let’s take a look at what you need.

Custom Corrugated