Another nearly impossible to notice stash relatively easy to make, and can be done with household items.
Step 1: Materials
1. Plastic food container
2. Saw or knife
3. Glue or tape
4. Dresser drawer (preferably the middle or top drawer)
Step 2: Prepare Stash
Cut away part of one side so you have access to your stash, but it doesn't fall out. You may want to plan out your stash in advance.
Step 3: Glue Stash in Place
Um... Pretty self explanatory... Glue your stash (not the items to be stashed!) to the back underside of the dresser drawer.
Step 4: Notes
If you've done this right it should be undetectable without knowing what to look for. To get items out or to put them in, simply reach in and get them or put them in.
P.S. If you get busted, you never even heard of me.