This is my main yarn stash. It fits under my (twin) bed width-wise and holds basically anything that is not "sock-yarn" (ie fingering or dk weight yarns).
Yardage-wise though this second bin is the source of my excess. The types of sock yarn that come in just one hank or ball are at the bottom, while matching dyelots are paired in plastic bags. Right now these bags do not fit neatly in with the lid closed, which is my ultimate goal. I counted that there was about 70 pairs worth, but with all of this "sock" yarn my stash total comes to 41.75 miles (67.19 km). Figuring that I knit 21 pairs this past year, this puts me at about 3.5 years of sock yarn stashed.