Your Level Up charts can be kept inside the Vault X as well, however they will be lose inside the binder.
Another option for the Level Up charts is to purchase a small 6 x 4 photo album, which will fit the chats and your tennis bag.
Grip Sizes Information
A rough way of finding out is by holding a racket in your normal forehand grip. If the racket is of the correct grip size, the distance between your palm and longest finger should approximately be the width of a finger.
If you do not have a racket available to measure, an alternative way is to measure your hand using a ruler. Line up the ruler on your palm in line with the intersection of the thumb and fingers. The length from there to the top of your ring finger (next to the little finger) is roughly the right size.