We all know that its important to keep our body hydrated, but for some the idea of drinking water can become a chore. Out and about, finding water can be difficult and lugging around a water bottle can be less than ideal. We never thought that a tumbler full of water was something that was less than ideal to carry in our bag, but the guys behind Memobottle seem to think that the ideal shape for carrying around water is in the size of a sheet of paper. It comes in letter, A4, and A5 sizes to blend with the books and documents inside your bag.