The GoToob+ features a new, larger opening making it both easier to fill and clean. The bases of all the GoToob+ tubes have been contoured so that they can now stand up easily for even easier filling. There are larger size indicators on the silicone (making the size clearer to TSA agents so you can breeze through security), The GoToob+ collar has our exclusive LoopLock, which makes it almost impossible to accidentally open the cap, further reducing the chance of any leakage.