38L they are. Cost me about $460 australian which was for the box, mounting bracket and the locks which is relatively cheap here compared to other alternatives. It's all SW motech, their stuff is superior to the competition in my opinion.

Nelis it was the pics of your bike that got me wanting the black trax top box and panniers. Just need to save up a bit for the panniers now.
What size panniers are on yours? and are you happy with how they have held up?