Collapsible cup: It’s literally never been easier (or more fun) to bring your own reusable cup! This compact cup collapses down to just 2 inches. Whether you’re sipping coffee or a smoothie, the 450ml cup is perfectly portable for your commute, camping trips, tea at home, and travels. When you’re done, simply remove the heat sleeve, open the tab, and collapse it down. Leak-proof, includes a straw!