I stow all my yarn in these zippered vinyl project bags. I use two sizes for yarn. This yarn below is stowed in a yarn cupboard made from a kit we got at Home Depot. But, I've got just as much yarn stowed in a big wicker trunk, and more yarn stowed in my knitting room. Yeah, you guessed it...my yarn condition is SABLE. These photos were taken 4 years ago...and my DESTASH efforts have really helped! 2012 and 2013 have been my best years for knitting only from stash!
As I look at these photos below, I can readily identify the bags of yarn that are knit up and out of the 'closet'! LOL
Here is a small project bag, and it's holding 14 balls of grey yarn! They're aran weight, too!
You can really cram a lot in the smallest size!