Rule #1 of big wall climbing: everything has a clip in point.
There are a lot of critical items on the big wall climb, but probably the most important (and expensive!) one is your gear rack. You absolutely never want to drop it! Here's a way to minimize the chance of that ever happening.
Get two strands of stout cord, each one about arm’s length. (I’m kind of a cheapskate, so I use parachute cord; it’s rated to about 550 lbs. and plenty strong enough. 5mm cord would also be a good choice, and a bit more durable.)
In one end of the cord, tie a bowline around each shoulder strap of your gear rack so the cord is permanently attached. In the other end, tie a small figure 8 on a bight loop, just small enough to clip a carabiner. Repeat for the other cord and other shoulder strap.
When you finish your lead and are at the anchor, pull the two cords around to the front, and clip each one to a separate anchor component. Only then, after the rack is secured to the anchor by these two redundant points of connection, do you take it off your body.
By clipping to two parts of the anchor you spread it apart a little bit, giving easier access to restock the gear when your second arrives after cleaning the pitch.
This tip is from big wall experts Pete Zabrok and Mark Hudon