Look into the Dakine Sequence Bag or the Burton Zoom bag. Both are camera specific and have some really slick features. Skis can easily attach, as for the boots, put the straps together and sling them through of the outside compression straps......you prob. don't want to rock the boots inside with your camera......seems like disaster ready to happen.
Nice feature about the sequence is that you can remove the padded "camera block" and use the pack as a full on day pack.
get the Burton Zoom pack. it has heat insulated/clear pockets, with water proof zippers and a big flap that cover all the gear, to keep snow out. it can alos hold a tripod too. Im buyin it.