I bought these because my favorite coffee I've had for years isn't in Kcups. I'm using filters in reusable kcup, but let's face it, it kind of defeats the purpose of the whole kcup concept. Waking up in the morning and filling one of those refillable bottles was the biggest drain, not something that would have driven me nuts at 4am. So, determined to find a better solution, I found these little gems. I can say they work great and I usually fill them for 2 weeks. They appear to be airtight as described. The cup I made two weeks ago tastes as fresh as the first day I filled it. The only negative thing I can point out is the price for one. They're a little pricey, around $0.35 each, especially considering you can get many thousands of cups of coffee at that price. But like I said, my type of coffee doesn't come in thousands of cups, so I'm willing to pay for that. Second, and it's not a huge issue, but after using one the coffee seems to have receded and been sitting on the kcup. Not a big deal but it will drip if you throw it away. None of my pre-filled jars have ever had this problem, so I suspect it's because the filters on these jars are deeper and hold more coffee. ppx_yo_dt_b_asin_title_o05_s00?ie=UTF8&psc=1 is great for filling these cups and is just as great for refilling. No mess and the perfect amount every time. So finally. I recommend them if you are happy with the cost or if you want your coffee to be stronger. If your brand comes pre-filled, it would probably be more convenient to just buy a pre-filled one.
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