Learn to hide your valuable secret stuff safely in a pocket-sized tiny compartment that nobody can find but you. Bring it around school/work and it will look exactly like a regular, honest, innocent marker;. But when opened from the bottom, you will learn this is no ordinary marker. If you like it, please rate it. Store money, or anything you would like! Very easy to make!
Step 1: Tools and Time.
About 1 minute.