This ultimately comes down to how much coffee you drink every morning. Most coffee mugs come in sizes ranging from 8-12 oz.   However, those that drink lots of coffee or tea before work each morning may find that this amount is not enough. Those using travel mugs often take them to work and sip their beverage during the daily commute. Anywhere between 16-24 oz. may be a more suitable amount for true coffee or tea lovers.   If you don’t drink coffee or tea very often, prefer cold drinks, or like to enjoy certain beverages in smaller portions, then there are also 3-6 oz. mugs available. The 12 oz. ionmug, though, is just the right size and can be a happy medium for just about anyone, no matter how much coffee, tea, or hot chocolate you sip each day.