Lay your plastic bag flat on the table, fold it over lengthwise twice, so you end up with a long strip.
From the bottom up, start folding the strip into triangles, until you get an end that you can tuck into one of the triangle's sides.
What you get is a nice, tucked up triangle. No bags overflowing your drawer, very convenient in a small kitchen because you can make do with a very small space for your bags.
P.S. I know that kitchen worktop is absolutely hideous, it's on the top of my wishlist to replace it. In fact I want to replace the whole kitchen, but with our current budget, that's not an option.