Review on Compact Coffee Dripper for Backpacking, Camping, RV’s, Travel, Home, and Beyond! by Harry Love

Works great. Another reviewer complained that the product fits too tightly in your cup and therefore doesn't allow the needed heat/steam(?) to escape and then causes the pressure build up? or so complicated. He/she had to drill some small holes in the flat "shelf" of the dripper resting on your cup to fix the problem. Not really sure what happened to them. Works just like my homemade kitchen dripper that I use every day. Works flawlessly. Suitable for #2 paper filters.