You might run into one problem with using the waist packs to carry...
the belt that the pack is attached to is, well, just a belt. *Most* fanny pack holsters have a tapered line coming from the bag and graduating into the belt to provide support for the weight of the weapon. If not, the pack will flop over.
The extra material on a holster pack allows the pack to stay firmly against the bod, no matter how much weight you put inside it.
Now... their "hands free tech sling" might work well, not sure where the opening is and how quickly you could draw, but it looks like it might work well and stay stable.
Their "hip/holster bags" look more stable, but they are closed by velcro and seem a little bulky.
Just MHO.
Geri Weaver
------------------
BlackHawk Authorized Dealer (BAD) - "Better than catalog" prices & free shipping
http://www.geardup.com/gearedup.htm