Perfect size means reduced water waste. 10 oz bottles are easy to drink, no throwing away partially consumed 16.9 oz bottles.
10 oz also means it is easier to keep track of worker daily intake requirements using a hydration formula guidance.
The 150 oz. pack weighs less than 10 lbs compared to traditional packaging weighing more than 27 lbs, making this easier to allocate and handle.
The smaller bottle size also means easier carrying on-the-go in uniform pockets.