We’ve all heard the saying “Imitation is the sincerest form of flattery.” I’d like to make the distinction between “inspired by” and “full-on copycat” here. Since Knock Knock was founded, in 2002, we’ve been proud to see our influence all over the marketplace. We believe in staying on our game so that our creativity always keeps us ahead of the …
KNOCK KNOCK® KNOCKOFFS SOMETIMES IMITATION ISN’T SO SINCERE

Why would anybody think they could copy this, our best-selling product of all time? It's for grocery shopping, not copying!