topbox bag dimensions

[gtgt2112]

well getting ready for our tour round France.
I am considering the bag for the topbox, and would be grateful if someone out there could tell me the dimensions of the bag. I know it is designed for the top box but am wondering if it leaves room for stuffing things in around the side or on top.

[cropbiker]

 There is room around it and on top.

When I travel with the top box liner I also have have a disc lock down the side of it in the top box. My iPad is usually tucked in there and plugged into the power socket. I will usually have my waterproofs sat on top of the liner bag so I can get at them quick if needed.