Experience Bank

This small and simple mod allows you to use the "Experience Bank" block to deposit experience from yourself into empty bottles to be broken open later when you need it.  It removes 100 XP from you and stores it into a "Large Experience Bottle" that can be stacked up to 64.  The bank block itself is made from 6 glass, 2 chests, and a bottle o' enchanting.

Very simple and very small.