It is funny that I post them here, but they are desirable to me since I was at a young age. And I still have that fever. Quality must be the first reason why they are desirable. The one I got in kindergarten can still be used. These stainless steel constructed vacuum bottles have excellent heat and cold retention. It has super wide mouth and easy to clean nonstick interior. Also, they have a variety of products to accommodate different needs. Practicality is their strength.