Gina: I think the inclusion of the Mason jar in the smoothie-themed Naturalbox is perfect. Because of their vacuum seal, the Mason jar is ideal for on-the-go or storage of smoothies and even for the different smoothie ingredients. There are even blenders on the market, where the blade screws perfectly onto the Ball Mason jar, making for a DIY magic bullet for your smoothies. Naturalbox and Ball Mason jars are also a perfect fit!