This is my PVC tool tube I have on the KLR650. I road this this on all through my 7,000 plus mile trip through Canada. Never fell off.
All I did was get a PVC pipe cut it to the width of my skid plate, paint it black then threw some test plugs on the ends (got mine from lowes). It’s attached by hose clamps and a couple zips for good measure! hah.