Firstly, the flat square shape of the bottle makes it easier to store. Because it takes up less space than a traditional round bottle, it is more convenient for retailers to stack on shelves and for consumers to fit into their refrigerators or bags.

Secondly, the flat square shape also makes it easier to grip. The flat sides provide a comfortable and secure hold, making it less likely that the bottle will slip out of your hand.

In addition, the flat square design can also be more environmentally friendly. It is more efficient to transport and store, meaning less energy is consumed in the transportation process. Additionally, the reduction in packaging material required for the flat square design can result in a smaller carbon footprint overall.

Overall, the flat square beverage bottle is a practical and innovative solution to many of the challenges faced by traditional round bottles. As consumer demand for more sustainable and convenient packaging options increases, it's no surprise that these bottles are becoming more and more popular in the market.