Humm, while I love the idea I'm not quite so convinced by the execution. If using the double rail, just how big does it end up being? It just looks big and unwieldy to me. Or is the idea that you would separate the parts before using them? If so what's the advantage of having them connected in the first place? I'm also not quite sure I see the need to have two carabiners on the same tool, couldn't one end have been used for something else?I'm not bashing here, like I say I might just need convincing of the merits.