This reusable plastic bottle is specifically designed to fit into a briefcase or other bag.
It’s called MemoBottle and began as an idea on Kickstarter.
The product was designed with a mission in mind- reducing our consumption of single-use water bottles. The designers figured that if a bottle were finally shaped like the other objects we carry around, like laptops and tablets, it would also fit into the bags that we carry around. So they threw out the idea of a round bottle and started from scratch to come up with the MemoBottle design.