The Pactiv line of paper cold cups combines form and function. The double poly coated board and leakproof seams ensure the beverage stays where it belongs, while the exterior design (coke or impact print) draws the eye.. Pair with the available range of polystyrene lids for a fully finished and functional cup. Pactivs line of paper cold cup ids are made of high-impact polystyrene. Flexible, malleable and with pre-cut straw slots, these lids form a leak proof bond with the Pactiv line of paper cold cups.