Great idea! Few points to consider: -if I have to drive there to refill my containers, I may prefer it to be in a place where I can do some other things: gas station, supermarket, etc -will it refill certain quantity or I can specify what I want? The later would be preferred by user. -if it's my first time there, how can I get the recipient? It may interest the brand's to provide their own which looks equal to the standard. Brands use package as advertising (I see that shampoo at your home and I get it. Additionally some people may not want to look cheap by using an unbranded package.
I really like the idea, becuase you never know where you fail in your interview/resume. Was it the way you spoke? was insecurity? It is difficult to see yourself in perspective to know your weak points.
There is a Spanish construction company, Acciona that has a blog about job search with advices and so on. It could be something similar, either posting common failures with specific examples (without the name, obviously) or the compromise of the company to "help you out" for your next interview. It would be something that the company could state on their Human Resources or CSR.