Ah, yes mine is the #2 version...with the curvy shoulder strap. I just tried it on the left side...no problem because the strap has a curve in it the fit is good.
From memory there is a double wammy joby too ...for 2 camera's. Incredibly good value these straps.
I read somewhere they weight rated it at 1kg. Mine set up is way more than 1 kg & it is very secure indeed I can't see the strap or fittings breaking at all.