You may use your own boxes. However, they cannot exceed our maximum size restrictions. To measure your ground packages and ensure they are within our guidelines, use the following formula: Length + 2x Width + 2x Height. The answer to this formula must be less than 165 inches in order for the box to be shipped UPS Ground and stored. Please note that no side of your box can exceed 108 inches and we do have a weight limit of 70 lbs per box.