The Vortex by Edelrid is a swivel with ball-bearings, which has many applications. The ball bearings also function reliably even when subject to heavy loads. One possible use for the Vortex is the construction of a haulage system where the haul bag doesn't constantly turn on its own axis - this way the rope doesn't twist as violently and it makes hauling a lot easier. In particular, the Vortex can be recommended in its low weight and compact size - a really practical accessory.