The LongPlay edition from KeepCup consists of two cups, one inside the other. The inner glass cup is covered with a removable Tritan booster, creating a double-wall vessel. The booster increases durability, retains heat, and may act as a second cup when needed. KeepCup is perfect if you are often in a rush and drink coffee on the go. Remember that KeepCup is neither vacuum insulated, nor leakproof - the idea of this Australian company was to create an ecological alternative for a paper cup.