Our signature boxes are 44 ECT Singe wall corrugated shipping container with a 44 lb per inch crush test strength and are rated to hold up to 45lbs.
*note Boxes with weight exceeding 45 lbs will incur additional overage fees billed by UPS directly.
To avoid overweight boxes, be sure to pack evenly distributing heavier items (i.e., books) throughout all of your boxes. Use appropriate padding in between items as well as to fill gaps. This will ensure your items do not shift inside the box during transport.
If you are concerned your box may be overweight? Just step on a scale and note your weight, then pick up your box and step back on the scale. You should now be able to estimate the weight of your box with a little math.