Here is what to look for in a moving, packaging or shipping box.

Cardboard Moving Boxes
Corrugated Pads

Double walled

Doublewalled corrugated boxes use two layers of corrugated cardboard (also called flutes). This construction provides added strength and stability.


ECT stands for Edge Crush Test. The ECT is the true performance test and is related to the stacking strength of a carton. The edge crush test is a measurement of the edge compressive strength of a corrugated box.
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Regular Kraft Boxes


The size of box is of course important with any selection. You do not want your box to be too big, nor too small. When your box has room to spare, it leaves the chance of fragile and breakable items unable to meet their new home. You can add bubble wrap or packing peanuts to provide much needed cushion, or choose a more suitable size of box for your needs.
All Box Sizes

ECT - Edge Crush Test

The corrugated industry determines strength with two tests. The long time standard has been the Bursting (Mullen) Test which is a measure of the force needed to rupture or puncture the face of a corrugated board. This is measured by the Mullen Tester. The Bursting strength is reported in pounds (for example, 275#). A newer standard is the Edge Crush Test (ECT). This is directly related to the stacking strength of a carton and boxes. The ECT is a measure of the edgewise compressive strength. To use this measurement, it is measured in pounds per lineal inch of load bearing edge (lb/in). However, you will usually see this value reported as an ECT.
ECT Guide Bursting Test Minimum Edge Crush Test Maximum Load Per Carton
Standard 200# 32 ECT 40 lbs.
Heavy Duty 275# 44 ECT 65 lbs.
Heavy Duty - Double Wall 275# 48 ECT 80 lbs.