Shoulder strap for OM-D EM5

Hi,

I have been using the olympus camera strap but I would like to use a shoulder strap and have the camera on my right side (something like the strap for the heavier dslr). I could put the camera behind my back when having photo taken by my friends and look less a tourist when I am around.
The original strap is too short even extended to the max.
Any advice on what to look for?