Excellent Chalk Bag

Size reference: Female--my hands are 6.5 inches long from wrist to tip of middle finger; about 4.5 inches across.
USE, FIT, & PROS:
I love this chalk bag. I've had it for about a year now, and I have no major complaints. My hands fit nicely in the bag, and I have a size medium. (You should compare the depth/width of the bag to your own hand size to be sure it will fit nicely.) I love this bag especially on days I do laps, when I prefer something light that doesn't weigh me down (yes, some chalk bags can weigh you down a little). It's very efficient. I love the color and the drawcord doesn't get stuck as often as other chalk bags I've used (despite the continual presence of chalk on the cord).
When choosing a bag, I think the things to look for are a sturdy ring at the top that keeps the bag wide open so it doesn't flop closed--the components involved in keeping this bag put are nice and firm (see the video: even when I twist and turn it stays in just about the same place).
Other things to look for are how much room you want for your loose chalk/ball--some people like a bigger bag so they don't have to replace the chalk as often. For me, I replace my chalk every month or so (I climb 3-4 days a week) and the size of this bag is just fine (I would call myself a moderate chalk-user). Another thing to look for is the quality of the belt; this one is great and the buckle looks & feels sturdy. The inside of the bag is nice and soft, and I've never had chalk explode out of the bag when I cinch it shut. It also has a loop for a brush, which I've never had to use, even though I do use it for bouldering as well. I'm not too picky!
CONS:
If you're looking to do mostly bouldering, you might want to think about getting a chalk bucket instead. This isn't necessarily a downside to this chalkbag, but if you want something that will do double duty for bouldering and sport/trad climbing, then you might want to find something a tad bigger.