Kevin wrote an answer about Arc'teryx Altra Backpack 75 - Men's - 4577-5248cu in on April 6, 2011
I have the Altra 75 pack and improvised a little here...happened to have 8" cable ties (purchased at Home Depot) and fastened a ice axe loop to one of the lower openings in the daisy chains located at the bottom of each side of the pack. For now, I have the side compression straps holding the shafts in place. This is a very light weight solution and should work fine. I do have two ice axe holders coming from Arc'teryx and will use those to fasten the shafts to the upper daisy chains located on each side of the upper area of the pack.