Keeping hands that help themselves in the company shared refrigerator, at bay.
Anti-theft lunch bags at your service.
“Hmm, tasty sandwich 
. Anti-theft lunch bags. Because stealing another man’s sandwich just won’t fly here.”
Image courtesy of http://imgur.com/gallery/wtVxF.
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Ha! Excellent!
Be sure to stock these bags when friends and family come over who like to devour the fridge contents.