Yes, you can use cases that are not listed on our site; however, you will have to measure and weight your case and enter accurate dimensions and weight when booking.
Your case may not be listed because
1) We haven't heard of it.
2) We don't have any experience with it.
3) It is not suitable for shipping based on our experience.
If your case is not listed, please contact our Support Team, and we'll consider adding it to our list if it's suitable for shipping. You may also save your case and its dimensions and weight to your account for more easily and quickly booking shipments in the future.
You can measure your case by following the instructions in this video.