Upvote:4
Rather than bringing single purpose winter gear consider equipping yourself with multi-purpose gear:
Rather than snow boots bring a good set of hiking boots instead. For me those work well enough in both winter and warmer conditions. (But then I don't like carrying my backpack and hiking on flipflops.)
Layer up: rather than a thick winter coat get a (gore-tex or similar) hard shell. That doubles as a raincoat and windbreaker in many other conditions, on mountain treks, ferry crossings etc. Combine that hard-shell with a mid layer such as a soft-shell or down jacket (which compress and travel really well) that are individually also quite versatile.
A merino wool T-shirt is good thermal base layer in colder conditions and something you can wear on it's own even in the tropics.
etc.