ElectricaRoowrote a review of DAKINE Mission 25L Backpack - 1500cu in on December 6, 2011
Can it carry your snowboard? Yes. Can it accommodate a hydration pack? Sorta. Can you carry your laptop inside? Yes. Can you easily carry a water bottle? No. Are there plenty of places to store sunglasses and goggles? Yes.
If I had it to do over again (and I suppose I do), I'd go with a pack that better accommodates a hydration pack. This pack has a pocket for the bladder (the laptop pocket) but no easy way of getting the hose out of the bag and accessible. There is no tiny hole in the top; you're forced to just shut the zippers of the main pocket around the hose. Also, there's nowhere to put a nalgene or even a regular old 16.9 oz. water bottle. Water fail, I'd say.
It's plenty big for granola bars, sunscreen, and anything else you'd likely need on the slopes, but as a travel backpack, it's undersized, particularly when you have your laptop and power adaptor already jammed in there.
Overall, I'd try to take a look at these in person before investing in one. Know what your priorities are in a pack and make sure they are WELL established in the pack, not just a slight hint at them.