Sachets are perhaps the most important innovation to happen in the Indian market in the recent times. They say that litmus test for a real good innovation is that after it is executed it seems very simple and apparent, that is true for the use of sachets in India. Another reason could be the fact that we are naturally used to buying in smaller quantities be it buying cigarettes in sticks, oil in loose , one just needs to go to the hinter lands to see what can be sold in smaller quantities.
The overall role of small packs in increasing penetration of categories like shampoos in rural India is an old story.
A few days back saw the small packs of Hershey's Syrup. My guess is that this is an adaptation for the Indian market. Will surely promote the trial of the product especially in India where familiarity with the category is low.