Thanks for the replies guys.
Does anyone know if the BM panniers are waterproof?
I never even considered that they may not be!
I currently have Givi MAXIMA 52L topbox, but was thinking about panniers as its better to spread the weight lower.
Throw the Givi away, far to top heavy anyway loaded. then don't waste your money on system panniers which are useless and buy yourself some proper metal boxes from Touratech or Metal Mule or Vern' .........................

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nenau Filtering is no problem with metal Mule 38 litre panniers or the others unless really big capacity. As for the exxtra width of the bars all that does is put you higher up, so you can see better and take out the odd car mirrir

as you pass. Filtering on a GS is no different to a sports bike