After 3 months I still use the original strap that comes with the camera. Prior to buying the E-M1 and the 300mm f4 I had the original E-M5 and the 40-150mm f2.8 and was then using a sling. However the sling I had was not working great with the new setup. I'm now looking to get something new, the original strap isn't the worst but I feel there must be better things out there. Would appreciate any advice on what to get. 90% of the time I have 300mm f4 on the camera as birds and wildlife is my main genre. EDIT: I forgot to say that I'm often out shooting for long periods of time.