I think Kata A91E Reflex E will be better.
and you can use it this way like thinktank photo.
If you carry a back pack that come with 2 ring so you can hook on to it..
http://www.thinktankphoto.com/ttp_product_CmraSpprtStrp.php
I recommend OP/TECH Straps. Very comfortable and got a buckle for quick release too.