The ST955i panniers were inside the mirror lines & would easily take a full face helmet in each side. The top box would take 2 helmets & summer jackets.
WTF went wrong with Triumph pannier/topbox design? They've not designed decent kit since 2004.
The panniers on the TS are 1100mm wide, huge outside & small inside, a helmet will fit in the lhs one but nothing else.