Sturdy with a great feel
I saw a climbing buddy of mine one day sporting this bag and after one quick look at it, I knew it was time to retire my heavy, broken chalk bag that I have had for years. The C50p chalk bag is extremely lightweight without sacrificing durability and construction. It has an angled top for no-miss reaches and a sturdy plastic ring around the top lip assuring that you're not fumbling around when every second counts. Durable, two-chord drawstring, simple and to the point. Filled to the brim with chalk, you wont even know that you have it on. It's that light.

Solid
This chalk bag is a great size for sport climbers. Waist belt is very convenient and secures the chalk bag however you choose to wear it. Drawstring closure seals the opening nicely to prevent chalk puffing out when in transient.

Excellent for the money, but not without equal.
Great bag overall- the ringed edge makes it incredibly easy to get your hands in and out, and I found the angled opening very agreeable to use. I also appreciated the small hidden front pocket with a retainer clip for keys or something else on the small side. Downsides include its small capacity, and the increased likelihood of spilling chalk because the rigid edge keeps the bag open all the time.

I loved it
The angled design made it much easier to get my hands in and out, that and the ridged rim were a godsend. I did find the capacity a bit limiting, and if you are going to be doing a lot of bouldering you'll want to look elsewhere as the stiff rim causes more spillage on falls than a fabric one.

Alright
This is my first chalk bag, so I don't have much of a comparison, but I agree with other reviewers that you should by no means get a smaller size than this. I have very small hands and this size is just right. I always make a mess with the chalk, I don't know if it is me, the bag, or my chalk sock. It is definitely cute, like all Arcteryx stuff, but if you need to save money, go for a cheaper one. The build quality is definitely good, but one thing I hate is the enormously long belt - once tightened, the rest of the strap is hanging down, really annoying. I try to clean the bag once in a while, outside is fine, but it is difficult to wipe off the chalk from the lining (which forms the lid when the drawstring is tightened).