Yes! You may use your own boxes whether you are storing or shipping so long as they are within UPS guidelines (https://www.ups.com/packaging/?loc=en_US).
We do HIGHLY recommend that you purchase a SpaceShip supply kit as they are within the guidelines for UPS. Keep in mind older boxes lose inherent integrity over time and may not travel well, which will not be covered in the insurance. You may purchase shipping boxes wherever they are sold. Please note that moving boxes are not adequate for shipping needs.
When using your own boxes you will need to calculate the boxes total inches and the billable weight to ensure the boxes are within the UPS guidelines, and freight is billed correctly.
If you underestimate the weight and dimensions of you boxes there will be additional charges assessed.
- Billable weight can be calculated by doing LxWxH/125
- Total cubic inches can be calculated by doing L+ (2x Width) + (2x Height).
Note: Pricing will vary for shipping depending on the size and weight of the boxes you use as well as distance.