better idea, if you want to steal stuff.
goto mcdonalds or any other fast food restaurant:
buy large soda, drink soda, most of it at least.
goto store you wish to acquire things from, drop small items into large cup (perferably items that will not be damaged with water). walk out of store
most stores your not allowed to go in with backpacks on for theft reasons. i have never been caught the cup method has always worked.