Swapped out and lowsided on asphalt that had recently had a new fog seal applied. I slid on my side case and crash bars for 45 feet on asphalt.
I had to replace the latch in the first pic as it was ground down and would not work.
Notice the case ground through the first (outside wall) layer. Inside layer (second wall) still intact and waterproof. I think hard cases would have been severly bent and non functioning afterwards.