The problem with carrying alot of bulky "hard" items while skiing is that you are increasing the risk of injury should you and your boards switch positions(ouch). I think a good whistle, the proper protective clothing, maybe a A.M. heatsheet, a small fire kit, a photon micro, a map of the resort and a small multi tool would be sufficient. AS LONG AS YOU STAY INBOUNDS!! I would just carry the items throughout your body and not bulk them up in one area.