The 0000 steel wool is very gentle on alumium and other metals, and generally leaves no marks just dont use it on enamels or other coated surfaces
But, that's to be expected of such a massive duffel
If you miss and the line hits any other surface other than the water, your character will recover it
The bag also has load lifters to keep your gear tight and secure to your body when needed, and has several external loops and tie downs for small towels, blankets or other accessories
Some argue that this test is imperfect because it requires a helmet to pass impact testing twice in the same spot, as would happen in race car/roll cage situation, where the driver is strapped in, but is less likely to happen in a motorcycle accident, where the physics of a crash are likely to be different