Just returned from a 1200 mile trip down Baja California, Mexico with this saddle bag and I'm very satisfied with it. Easy to tighten down to the saddle and seatpost, with minimal swingingshifting when out of the saddle. The webbing on the top was very handy to stash a jacket, food, etc., and kept things secure. It seems very durable. Can't comment on waterproofing, as conditions were dry.
I have experimented with many bags over many years as a recreational and commuting. cyclist and the Banjo bag has proven to be the best of all in terms of size and attachment. Other bags invariably don't hang or fit right or are either too large or small. Banjo is just right
I bought this pack mainly for commuting purposes as I can't use any racks on my Warbird. The pack has a surprisingly good amount of room, looks sharp, and is easy to install and use. I've only made a couple rides with it but am quite happy with my purchase. At some point down the road I would love to do some bikepacking with it