I purchased 2 more of these clear bags after riding cross country with the original one for the past 3 years in Michigan's Upper Peninsula. I travel with it on 1-6 day rides strapped in a metal mesh basket on the front of my machine; 100% waterproof and no signs of wearing out. Easy to wipe off and you can see what's in it. A great value on one tough bag.
I guess it does what it;s supposed to do as long as you don't overpack it. The opening doesn't seal...it has a flap covering the opening, and then you just roll down the top and secure with the buckle/handle thingy. This will get the job done, but there are better solutions for motorcycling.