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    Double Shot

    Travel with your coffee? Try a good thermos

    I usually don’t use a thermos for my coffee. No need: I like it then and there.

    But lately I’ve been sampling them, to test out travel options. I started this at one of the best spots to sample anything: the beach.

    Miir — a name inspired by preservationist John Muir — makes some of the better ones out there (And each one purchased provides someone with clean water for a year). I also tried a Klean Kanteen, a solid option that has a relationship with Stumptown.

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    They both did well, but Miir did a better job at holding the heat.

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    It has a double-wall vacuum insulation, saying it will keep cold fluids cold for at least 24 hours, and hot fluids hot for at least 12 hours. It has a nice flip top opening, preventing any spillage. They are sleek and sturdy.

    On my test, I filled each thermos with 190-degree water. Over three hours, the Miir lost about 10 degrees of heat every hour while the Klean Kanteen lost about 20 degrees (10 hours later, the Miir was still at 135 degrees, while the Klean Kanteen was at 100 degrees, but the Kanteen only advertises that it retains heat for six hours).

    They both did a solid job retaining cold water as well. But here is where Klean Kanteen may have a slight advantage: Both kept the drink cold, but the ice quickly melted in the Miir, while the Klean Kanteen was cold enough to retain the ice.

    Matt Viser can be reached at matt.viser@globe.com.