I bought my Side Street bag as we have a lot of traffic on local roads and it's much quicker to filter on a motorcycle however it doesn't quite suit my needs.
Positive points:
● Storage is great, lots of it.
● comfortable with the back pad.
● Holds up well in the rain.
● It did the the job it was designed for.
Negative points:
● I tried it on two different styles of motorcycle but on each it ended up sat on the pillion seat destabilising the bag.
● Sits too high above the head which ends up catching the wind too much (it's a set of golf clubs at the end of the day so I expected this).
● I found that even after tightening the straps, because of the wind and the pillion seat interference the bag would begin to tilt one side or the other on longer journeys.
I tested it on a number of roads and found it best on local residential roads upto about 35mph. At 45 it was OK but a little sketchy and just to try it I took it up to 70 briefly on a highway.... but that was probably a bit much to expect of it.
Overall, I'm probably going to continue to use the car for now as I have some highways on the route to my usual course but I would use my back9 if I was playing more locally.