[M_Six]

Originally Posted by dmatre

Yes, buy in Heathrow, seller seals it in a bag, and carry on plane.

I believe you are allowed 2liters duty-free into US. (That's my standard each trip through LHR).

One important note: if you have another flight after entering US, then you MUST put the bottles into your checked luggage for next flight. Even if in sealed bag, TSA won't let you pass with your liquor.

Thanks. Good to know.