Large and easy to clean, a mason jar is the perfect vessel for a big, tall drink on a hot day, whether it's a batch of sweet iced tea, or some strong, heat-fatigue-fighting iced coffee. It gets even better with the Cuppow, a cleverly designed BPA-free lid that screws in under the jar's band and turns the jar into a travel mug: its spouted lip is designed for sipping or straws, and helps me avoid spilling while taking a sip at the park or on my morning commute. If I don't manage to get to the bottom of the jar, I can just swap it out with the standard lid, and throw the whole thing in the fridge until tomorrow.