If you aren't planning to carry anything big or heavy, you can fit all of that in your jacket/pants. Unless maybe u plan to stash the backpack? Riding with one sucks. My jacket has an inner goggle hammock that stores them around the curve of your ribs (for example).
Otherwise the above seems pretty much perfect.
At the mountain we have a home owners lounge where it is all people we know so i usually stash a bag there. The problem is i have a huge trans pack from when i skied and i don't need to carry it with nothing in it.