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As I found an article about coffee consumption and productivity GDP, I tried to calculate my coffee consumption. 

Image courtesy of Arthur Charpentier

To make life easier, I only calculate my office consumption. A 250 g bag of kopi aroma usually last for 2-3 weeks, about six kg per year. I'm about as productive as Italians! Hmmm...

Anyway, recently-but-probably-always-and-just-realize-that I found problem when I had to transfer the coffee powder into a jar.

A bag of kopi aroma and a jar

The problem is, the jar's mouth is too small.

Jar's mouth is smaller than the bag

And to make it worse...

When pouring the coffee, some powder will definitely stuck and spilled

The solution is actually just simple engineering.

Just cut the top of the bag

No more wavy top

And voila! Almost no spill!