Not waterproof but will keep your stuff dry enough if you don't submerge your bag in water or ride in the rain for a long time. After riding many miles with the front loops of the bag firmly attached to the hooks on the back of the seat of my Honda CRF250L and the bungee straps and rear loops tucked into the rear hooks of my bike, the bag has not ripped or fallen off a 6 or 6 7 pounds of stuff bouncing around in it. The reason I tied the bag instead of bolting it to the fender (which would probably be the best way to attach it with the included hardware) is because I didn't want to drill through my fender. I would give it 5 stars for "easy to install" if it came with a good set of straps to attach it to the subframe.
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