The basket is made to fit a 200 count package of 8 to 12 cup coffee filters but it can also be used to hold tea bags or sugar packets etc.
This crochet pattern is now available on Ravelry.
Here is the one I made for my kitchen which is in Tuscany colors. The knob is made from a plastic water bottle cap. The pattern explains how to crochet the knob to cover a bottle cap or to stuff with cotton or yarn ends. The knob on the yellow basket below is stuffed with yarn ends and it makes the knob more round. Of course the knob is optional so you could opt to not add one.