Literally, Wedding Bag.
One handed change of lenses (and anyone who's ever shot with me knows I can't even do it 2 handed :))
ALl kinds of pockets, enough room for an extra flash, someplace to hook the external batt pack if you don't normally wear a belt, 2 modes-protected, where you can grab a lens with the cover closed, or open mode, where your (up to 3) lenses will stay put when it's open and you're running. I've got the 70-200 2.8IS, 24-70 2.8 and the macro in these pics.

After using it to chase kids up monkey bars last week (it was a lot easier 40 years ago) and at an amazing wedding last weekend, I'll vouch for it.

Alas, no room for a laptop, but then it doesn't weigh 40lbs either

http://goboda.com/

Posting into a protected gallery (due to contractrual obligations) the wedding that had me in awe last weekend.
1st install tonight, PM me for the link. It was AWESOME