Advice for a camera backpack when skiing

I'm going to go skiing soon, and for the first time I would like to take my DSLR with me while on the slopes. I have a Canon 600D with the kit 18-55mm lens along with a 70-300mm lens as well. I thought perhaps one of the lowerpro back might be good, but I want something that will protect the kit with a fall.

I know most of these specialised camera bags offer protection, but I presume most are designed for perhaps the odd bang here and there, or a small tumble, but maybe they wouldn't cope with a skiing fall and there are some more specifically designed for that?

Ideally I'd like one that offers protection for the camera and lenses as well as a way to easily remove camera without having to take off the bag, like this lowepro one that has the side access

Thanks in advance and I look forward to seeing what you have to suggest