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I've been brewing an Ethiopian bean recently on the Fellow Stagg Pour Over, and experienced something interesting. When brewing fresh at home, the coffee has delicious fruit notes. However, I brewed it once and took it in a travel mug to work, while it had the same qualities, the fruitiness tasted stale, and more like "old fruit".

I'm wondering if this is due to the coffee degrading due to travel, or if it has oxidized by the leftover airspace in the cup (note: this particular cup has an air-tight seal for a lid).

To summarize, my question is, does coffee oxidize while traveling, and does the amount of headspace you leave in your travel mug affect how well the coffee travels?

[EDIT]

I believe this question has already been answered here

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    I am guessing that you used an insulated mug, because you like your coffee hot?
    – Stephie
    Feb 3 '20 at 19:14
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    This is correct, though I think this question has been answered already: coffee.stackexchange.com/questions/367/… Feb 3 '20 at 19:15
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    Cool - a self-found dupe. Good find!
    – Stephie
    Feb 3 '20 at 19:16
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    Yes, is there a way I can mark this as a duplicate? I believe that's something earned with reputation? Feb 3 '20 at 19:18
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    Well, in the there’s no difference in flagging / voting to close as duplicate and self-deleting the question - and unanswered closed questions are deleted by the system after a while.
    – Stephie
    Feb 3 '20 at 19:20

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