The party just got cooler - and a lot better for mother earth. The Corkcicle Eco Stacker 4-pack is your stainless, stylish, and sustainable replacement for the everyday plastic, single-use party cup. This reusable cold beverage solution is made from 18/8 stainless-steel, features our signature easy-grip and non-slip silicone bottom, and is dishwasher safe making dreaded party clean up a breeze. The Eco Stacker 4-pack elevates every poolside celebration, backyard party, tailgate and is a step in the right direction in eliminating plastic waste.