I just smashed this out for my friend's ride from CoMo to Salt Lake. It sits on her Surly front rack. Xpac shell + military tent fabric liner (floating) = light and pretty darn water resistant.
My first bag with a covered zipper...I think.
Those loops go around the handlebars.
Velcro'd. Quick 'n' dirty.
Side pouch for snacks or bottle.
There's some padding in there too.
Hope it holds up. Stay tuned for photos from the trip.