In reply to Fergus Moore:
Haul bags are pretty specialist, you need to be able to comfortably carry the load, detach all the carry system so nothing snags when hauling, haul a heavy weight safely, it sit right at a stance, and be accessible whilst clipped to the anchors. All that, and be strong enough to resist the abrasion of loads of rough rock. I think skimping on a haul bag would cause more trouble than it’s worth, perhaps you could off set the cost and be miserable in a hammock over a portaledge?