if you put something like a plastic draining tray in the plastic bin- it keeps everything from staying soaking wet at the bottom - especially if you do back to back sessions without a dry out possibility.
+1
I find the change mat great, just be sure it's wedged in and won't spill in the car.
Takes harness, wetsuit and wet shoes fine.
The bag looks a bit overkill but may work if you really are short on space;
Contractor bags for the wet stuff. Been using these for over 20 years surfing, and now kite surfing, step in it same way as C-mat. I get probably 1/2 year to a year out of each one, when it looks a little worn I use it for trash and grab the next one.