When you're schlepping items back and forth to your car being organized is essential. The easier it is to pack and unpack the car is important when traveling. You're also going to have a small space to worth with at retreat or sew days so the more organized you can be the better.
I keep a set of tools in my travel kit that are intended to stay with the travel kit. I'm not always great about this, but I don't forget as many tools this way…as long as I haven't raided the kit.
While you may not need these every time you travel to sew, it's a good idea to have these in your kit. Just in case.