It's easy to clean and reuse the original filter.
As Newfoundlander pointed out, the clean side of the box containing the air filter is immaculate, therefore the air filter does a wonderful job of removing visible material from the air.
I replaced my original air filter after 11000 miles, installing a new Suzuki filter.
The original filter contained the bodies of a lot of dead hornets. Most of the license plates on those hornets said "British Columbia" :rolleyes:.
I figured that I could clean that filter, so I did, and then I set it aside. At 24000 miles, I took out the next load of hornets (why are those thangs so dumb?) which mainly had Florida plates (hey, maybe that's why ... nah!).
Anyway, I did reinstall the original filter after very carefully vacuuming it, brushing it, and inspecting it under strong light. In a year, we will see if my parsimony saved me $40 or cost me an expensive repair.
Actually, I think that the original filter, after 400 miles, was dirtier than the cleaned filter was upon reinsertion. I do not expect to buy another filter, because those things are really sturdy.