I am loath to wear two packs, one front and back. Instead, I use a claymore bag - the bag the actual mine is packed/shipped in. It has two sides, can hold a lot of stuff; and if you are so inclined, can be converted into a one big pouch bag. I accessorize mine with a d-ring, some paracord wrapped around the sling, and a pad duct taped to the sling. Maybe it doesn't hold as much as another pack, but is easier to slip on and off and doesn't cover my entire chest either.

As things stand now, I use the claymore bag as an immediate GOOD kit, with the minimal stuff needed to spend a night out. The pack has all the snivel stuff I need to be comfortable. With them together, I am in fat city.