What I meant was using a shoulder bag with an extra strap, worn around the waist. The shoulder strap can be worn cross-body OR on the shouklder nearest the bag, where it will tend to slip of the shoulder...which is fine if you want to go to an assignment, then slip the bag off as you shoot, then slip it back on as you take up another camera position. Basically, the waist strap is designed to spread out the load on both a shoulder AND two hips, which becomes essential when carrying an 18-pound bag full of stuff for any distance. The one you linked to, the Think Tank one with the concealable, wide, padded waist straps has the added advantage of being able to be slid "around back". The one shown in the video looked to me like an overgrown fanny pack.
Bags are so,so personal...I like Tamrac and Tenba bags, but also have some smaller, relatively inexpensive ones plus my newest "bag" is actually a 2-water bottle, large fanny pack designed as a fisherman's fanny pack: it has two side pockets for 500ml water bottles with elastic retaining strings for the bottles--PERFECT for my 24-105 L or for a 70-300, or my 135/2-L lens, OR TWO smaller lenses with the lens caps epoxied together back-to-back, like for the 50mm and 85mm. The main compartment is quite large, designed to carry a tackle box and other fishing stuff. It's stylish gray and blue, from WalMart. I bought it for fishing, but when I saw the water bottles I thought... "hmmmm...lenses are about that size!"
If you can manage to get the "shooting gear" down to two bodies, each with a zoom, then a bag becomes smaller and less-needed. Then, a 3-lens bag is all that is needed, since two lenses are in use on bodies all the time. I have a thin, low-profile messenger-style bag I got at Target...it's so skinny!!!! It's great for a flash and two or three smallish lenses. But I prefer the old-style "1980's" Tamrac or Tenba styled bags with 6 lens compartments, and one body, with a flat bottom and a flip-top lid that has buckles, 4 of them, or 3 of them...and some end-pockets, plus outer document pockets. But that's just me. There are just sooooooo many choices. Wish I could help more, but I really cannot.