This bag is a good size. The hand fits in great, it can be well grasped the Chalk and the hand in the bag can also be shaken. The hem at the opening also ensures. Chalk that remains in the bag and not get dusty, which should please the assurance partner especially with sweeping falls.
For pre-chalking I get in this bag even in both hands.
When closed, the bag a little Chalk lose anyway. so that can not be ignored by the bagging.