have you freed a big wall yet? You might check out the photo story in the last issue of Rock and Ice.
Most folks who are working on freeing a wall have full sized haul bags and a small seconds pack.
Our 99% Dyneema packs have definitely been hauled a bunch, but they're not haul bags, they're backpacks. A 30L Dyneema might work for your seconds pack, but…
Metolius makes the best haul bags that are always in stock. Fish makes great ones if you can wait. Mad Rock makes the cheapest ones, made in China under god-knows-what conditions.
Good luck.