(It's not just about how much plastic is used; the variety of materials that go into the packaging is key. Pringles with its distinctive tube is one of the worst: it has a metal base, plastic cap, foil tear off lide and foil-lined cardboard sleeve. The association described it as a nightmare.
I'm not sure which bin they should go into, but luckily I don't drink Lucozade, and I don't eat Pringles.)