Posted by a reviewer on Amazon

These cups have not leaked onto my shirt yet although when i remove the lid there is a bit of coffee residue below the hole which indicates a slow nondripping leak

Posted by a reviewer on Amazon

One important thing to note for any disposable cup be it starbucks or gj if the lid is attached such that the drinking hole is directly above the seam of the cup it is guaranteed to leak as the seam is a channel for the coffee to escape the lids seal

Posted by a reviewer on Amazon

Bases upon my knowledge of physics my hypothesis is that the pressure in between cups is lower than atmospheric pressure near sea level to wit the bottom of the cups audibly pop when they separate as the switch from concave to convex

Posted by a reviewer on Amazon

As others have said theyre a bit tight to get out of the stack but its not a big deal just wiggle one loose and go

Posted by a reviewer on Amazon

If you tap the stack on its side on the edge of your counter they separate easily

Posted by a reviewer on Amazon

That neither of us in the office could get a cup off

Posted by a reviewer on Amazon

If you plan to stack them on a table and having people use one hand to pick from the top then it wont be that easy