Have used the same one for years for several Nikon DSLRs. Have not ordered yet for my newly received X-T1, but it is next. Not a looker, but works really well. Quote from Luminous Landscape:
A couple of years ago I published
a review of the Upstrap by Sean Reid.
The Upstrap is simply a camera strap, so what's the big deal? The big deal is that it's the best damn camera strap in the world. Period. End of story.
The reason for this unequivocal praise is that it's the only camera strap that I know of that won't slip off your shoulder, whether the camera weighs 6 oz or 4 lbs. There are versions available for carrying large and heavy lenses, with quick releases and without. All of the materials used are the finest available, and the thought and engineering that goes into every aspect of their design and manufacture means that they do their simply job simply, and unobtrusively.