What size reusable coffee cup to buy?
A 12oz reusable coffee cup is the go-to choice for many coffee drinkers because it offers: Standard size for most drinks: Works well for lattes, cappuccinos, mochas, and Americanos without being too large. What Is the Most Popular Mug Size? The most common coffee mug size is 12 ounces. Runner up is a 16-ounce mug, which maps to a “grande” size at Starbucks.