Finally bit the bullet and gpt one from the US. Bucket loads of space, Open LHS or RHS without removing from bike. Separate roll bag about 18 litres. In built rain cover.

Seems like pretty good workmanship, 60 seconds to fit/remove. Shelf is velcroed in and is fully adjustable.  Sorry for poor photo quality, emailed from phone

 

 

looks good mate will hold heaps especially if you do note take pillion whots it on s tail heratige

How much and how high is your sissy bar???    No matter...Checked them out on the web....

 

Cheers...Sparra