The large 3 fl. oz. size gives you maximum volume for longer times between refills. All GoToobs are approved for airline carry-on, they're food-safe (FDA), and they're 100% BPA-free and PC-free.
GoToob Medium (2oz) Travel, Clear
GoToob+ 3 Pack, Medium, Clear/Green/Blue, 74ML, 2.5 Oz
GoToob+, 3 Pack, Large, Clear/Green/Blue, 100ML, 3.4 Oz
GoToob, 3 Pack, Small, Clear/Green/Blue, 37ML, 1.25 Oz