With everyone being more environmentally conscious, there are continually more eco friendly coffee cups and brands coming on the market. When you are looking to purchase one of these mugs, its important to check into the features of it. For instance, is it guaranteed to be spill proof or is that an issue for you? If you are someone who is on the go and drinking while you walk or has a tendency to drop your mug, you may want to purchase one that is strong and you have to push a button to drink the liquid. You want to look at how long the mug is supposed to keep your beverage hot, or if it promotes cold beverages, how long it will stay chilled. Of course, you do not need to just use coffee in these, but you can put in tea, juice or any other item you want to stay at a warm temperature.