If they don't sell whole beans
If a brand doesn't sell a whole-bean offering, it's a very bad sign. First, it's an indicator of potential freshness, but more so it means that the company isn't expecting their customers to tailor the grind size of their beans to the brewing method. It's much harder to make excellent coffee if your grind doesn't match your equipment.
Beans sold in bins
If it's not actually packaged, it's a strong indicator of poor quality because it shows a lack of concern for shelf stability, freshness, and exposure to light and oxygen, causing it to stale very quickly.
Lack of country specificity
Countries like Colombia and Guatemala aren't tiny; they have a lot of different coffees. Listing the farm or region inspires confidence in the sourcing methods, and although the lack thereof isn't necessarily damning, it's a strike against the potential quality.
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Dan Gentile is a staff writer on Thrillist's national food and drink team. He has been called a coffee snob on more than one occasion, but sticks and stones can't break his bones, because they've been strengthened by really, really good coffee. Follow him to Ethiopian beans and nebulous health claims at @Dannosphere.