Cans for soda, and other drinks are very normal everyday items. They can very easily be unoticed, and can be a great place to store and hide items.
There are many ways to do it, but you basicly cut loose the top or bottom, and put stuff inside it. There are even guides on how you can put a jam-jar inside to screw the cap back on.
Can with Jam-Jar Guide
I made very simple one with an empty redbull.
1. Use a can-opener and carefully cutted the upper edge on the can, and take it of.
2. Glu a heavy item under the top ( for example: a stone), and glue the taps back in place to make it look unopened.
3. Put the top back on.