Measure Boxes the Right Way!
Length  x  Width  x  Height

The longer side of a box is the length.  The shorter is the Width.  The spine of the box is the height or depth.

L : Always measure a box by the length first. 
This is always the horizontal measurement of the assembled box front.

W : The width is the measurement of the box from front to back.  This is always the sides of the assembled box.

H : The height or depth is the last measurement.  It is the vertical measurement of the assembled box.  Also, top to bottom as it sits. 

The strength of a box is commonly measured in Edge Crush (ECT), Gross Weight Limit (lbs), and Bursting Strength (Test). This information lets you know how much weight can be put into each box and how much weight can be stacked on the boxes. Every box made in North America has a stamp on it that states the pertinent information for each carton. Test is an industry term for the bursting strength of the box, as measured in how much weight it can hold. Weight is the actual pounds a box can safely contain without damage. Edge Crush Test (ECT) is the pounds per square inch strength. Here is a conversion chart so you can compare the scale for each measurement:

Strength Chart
Bursting Strength (Mullen) Maximum Weight Limit Edge Crust Test (ECT)
125 Test 20lbs 23 ECT
150 Test 35lbs 26 ECT
175 Test 50lbs 29 ECT
200 Test 65lbs 32 ECT
275 Test 95lbs 44 ECT
250 Test 120lbs 55 ECT

Double Wall Corrugated Board (Heavy Duty)
Bursting Strength (Mullen) Maximum Weight Limit Edge Crust Test (ECT)
200 Test 80lbs 42 ECT
275 Test 100lbs 48 ECT
350 Test 120lbs 51 ECT
400 Test 140lbs 61 ECT
500 Test 160lbs 71 ECT
600 Test 180lbs 55 ECT

Because our inventory changes daily, please do not hesitate to contact us to find out
about our current available sizes.