I've been using a simple plastic pour over (a cheap Vario) with paper filter. It's the safest way to brew coffee in the field: no glass, no ceramic, no parts that can freeze (a french-press can freeze together at -30º when not in use).
I buy all of my coffee gear at Eight Ounce of Coffee in Ontario. They offer a superb service! Check it out: https://eightouncecoffee.ca/