With those plastic cups and lids, the only next step is searching "smoothie recipes". There's no taping the top - as our grandmothers used to do, no more wrapping it in 10 sandwich bags - as our parents used to do. As if that helped.
Those 10 oz. crystal clear plastic cups will give you the freedom of grabbing your homemade milkshake or smoothie with one hand, adjusting the collar of your shirt with the other and skip to work, while no juice spills. Kind of magic, until you try it and see the magic behind it - airtight lids. The only trick a magician will tell you, "do" try it at home.