If it's the plastic H&B panniers that were OE KTM options, they're weird in having such small internal volume, given their external dimensions. The slimmer alloy ones might even have a greater capacity.I’ve got the full H&B luggage set,but also have some lighter slimmer alloy ones. I might use instead the H&Bs are a bit bulky,I have a zarges sealed ally box thatd make an excellent topbox.
They doI think the have a water carrier built into the "skin" of the pannier don't they?