The Cntrl+ Starter Kit includes the device in three sizes along with a silicone removal string and a travel bag. We suggest trying all three sizes in order to determine which size works best for your body. Start with the smallest size and if it feels too loose and/or you are still experiencing bladder leaks, continue to go up a size until the leakage stops. Once you have determined the size that works best for you, simply purchase the correct Cntrl+ Single Size Replacement kit moving forward.