Difference between sample quality and sample quality of Kashi shampoo

Hello, there is no difference between the quality of this brand shampoo sample and the sample, except for the weight, but the ingredients and effects in the shampoo are the same. The reason why we feel the difference should be influenced by psychological factors, because each product often takes 1 time, and the effect will be even more amazing. If you get used to it later, you will feel that the effect is not as amazing as before.