Locking top for milk?

While I do not know of a milk top that is lockable, you can get a thermos with a lid. They have ones where the lid and container both have handles that line up when it is closed. Just put a padlock through the top and container handles. This will effectively lock it and probably make the person stealing your milk feel like a fool when they see you open it up.

Milk Bottle Lock

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why would anyone want to steal ur milk. no i dont know where to get locking tops for milk cartons i didnt even know they made them. i agree do something to ur milk and see if they nick it again.

I wouldn't go as far as Cliff (urinating in it) but how about putting a little laxative in it, then see who gets a little 'problem' later on, at least that way you will find out the culprit (s).

i had the same trouble once but with my coca cola,i found myself urinating in it one day then put it back in the fridge,then made sure the person responsible was around and then told everyone my lil confession,i will never foget the look on his face,my coke was left alone after that.lol