Hi STEVE126A,
A couple of options are...
Think Tank HUBBA HUBBA HINEY [Mfr # 228]:
http://www.bhphotovideo.com …ba_Hubba_Hiney_Black.html
Depending on the application, I sometimes use one of these which are convenient & very good quality (either with the supplied shoulder strap or on a waist belt), for a 16-35f2.8L, 85f1.2L & 600EX-RT.
Think Tank SKIN BODY BAG [Mfr #052]:
http://www.bhphotovideo.com …_Skin_Body_Bag_Black.html
(rather than to store a Pro camera body), I use for greater capacity:
-capacity of three medium size lens; or 70-200f2.8L IS mkII, medium lens, 600EX-RT + Rogue Flashbender-small + Rogue gel set.
-the retractable zip bottom enables expansion if required on site (eg if say I remove a 70-200f2.8L mkII with TC2X mkIII from camera).
-wear on a waist belt, or with a shoulder strap.
-also has front expandable pocket for such things as Canon ST-E3-RT transmitter for OCF, spare camera battery &/or AA batteries, cell phone, business cards, pen & paper and zip pocket on flap for lens cap, lens cloth & brush.
Enables one to operate effectively, handling most photographic applications (80/20 rule), very compactly and with light–weight. Less is more!
Either option enables you to operate professionally, subtly and without looking like a gear-nerd or commando.
Mary