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Think they recommend against taking the cork off as it'll end up breaking apart taking it off and putting it on. I had a glass one with a silicone sleeve which was fine. Though I'd recommend against KeepCups for filter (or americanos for that matter). Over time the seal goes and ends up leaking coffee as you drink. Their proposed solution to this was to wait until the coffee had cooled a bit before putting the lid on. Pretty disappointing in that regard. I bought a new lid and it had the same issues within a few weeks.
mmccarthy
They are if you take the cork off.
You could replace with silicone which is happier in the dishwasher
https://uk.keepcup.com/band-glass