I vote for a snow shovel. Mine moves more snow, even hard packed, faster and more easily than an entrenching tool.
I keep a NATO e-tool in my car year round, but have a collapsible handle snow shovel for winter. It is a standard snow shovel with large steel reinforced scoop and D handle, but the shaft telescopes. The scoop carries a lot more snow each load than any standard shovel.
Got mine at Tru-Value for about $15.
Doug
Former USMC Mountain Warfare instructor(76-77)