what is the difference between the yellow...
what is the difference between the yellow and the orange packs, apart from the price and colour?
The difference is in the aluminum. The orange uses T6 aluminum which is the strongest aluminum and the yellow uses standard tempered aluminum.
From Voile's site:
T6 is the level of hardness reached in the aluminum heat-treating process for the Voile T6 model avalanche shovel scoop. Avalanche professionals, guides, patrollers, and rescue teams require this level durablity in their avalanche rescue shovel. All Voile T6 avalanche shovel scoops have deadman holes in the scoop to be used for snow anchors or for making a rescue sled.