I think they would work well most likely keep the worst of the weather out, when on a motor bike with your rifle slung over your back the back wheel flicks a lot of dust about covering your rifle with grit.
A mate of mine many years back lost a big 12 point stag because of this, he had his rifle( a Rem semi 308 ) over his back on dusty roads, the stag came out and he counted the points several times while trying all his ammo until in frustration he loaded one in and didn't aim and it went off. What had happened the grit and bits of pumice had built up in the locking lugs on the action and the bolt wouldn't shut properly. We washed the action out in Kero and back to not missing a beat.
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