I have owned a Bigma for about a year and have tried numerous ways of transporting it.
My favourite is to carry the lens across my body with the lens barrel resting on the forearm at the elbow. The camera strap I use is the heavy duty stretchy strap bought from Jessops (their own brand). This strap is strong enough to take the weight of the camera and lens (on the rare occasions that it needs to). This carrying method allows me to quickly get into a shooting position as and when the opportunities present themselves.
A word of caution about trying to carry the lens on a tripod. I did this for about two months and yes, it worked great but (there is always a but) I accidentally mispositioned the tripod when setting up on one occasion and the camera lens struck a wooden post and damaged the lens
. It's still away on repair in Japan
. I am not saying you shouldn't carry it this way but am giving a friendly warning to be careful.
Peter