This is one of those situations were almost any pack can work, just some packs are better and more specially suited to carrying snowshoes/snowboards in the winter. To me, the main considerations are 1) do you want insulated hydration, and 2) do you want a pack built to carry a snowboard. You can obviously do fine without, but there are winter day packs that do both. Generally winter packs are also larger, since we hope you are bringing enough to survive the night (recognizing this is BPL, that can be light stuff, but it still adds up fast).
BCA says they invented winter hydration packs (it works very well):
Osprey has winter packs and Dakine does too, both with insulated hydration and designed to carry boards/skis/snowshoes. Bottles freezing can be a problem, and there is an advantage to not having to take the pack off. These packs are all heavy, and lighter packs can work too. I would watch out for mesh pads that can accumulate a lot of snow.