Big wall anchors can turn into an incredible cluster if you don't stay on top of things and keep it tidy. An excellent way to do this is to keep the lead and haul ropes contained and feeding smoothly by using rope bags. It may seem like one extra bit of a necessary gear, but it can keep your big wall belays WAY more manageable and less tangled.

You have several options.

Low budget: Doubled grocery bags. Put one inside the other, Gorilla tape the handles together, and tape the two top edges together.

(This “double bag” trick is from the excellent big wall climbing book, “Hooking Up”, by Pete Zabrok and Fabio Elli, highly recommended for a big wall climbers.)

Metolius Big Wall stuff sack, size large.

Fish Gear makes some great rope bags. fishproducts.com > Product catalog > Big Wall

double and single Fish rope bags: