To keep the stove from sinking into the snow, I bring a 1' square foam pad, and a piece of windscreen foil so the burner won't melt the pad. Bring some kind of wind-screen even if your stove didn't come with one. More like 35 lbs for a two-day trip. By the end of the trip, I'm down to around 30 lbs. Remember, you are skiing, and balance is critical.
Every extra pound means shakier turns and more face-plants.
The above are general suggestions. Please use your own judgment in packing for any backcountry trip.