I have always wondered about putting storage within the main triangle of a frame. We now Tato has gone and done it. The big issue with this location is the width of the storage. Tato's bike accomodates 95mm of width, which is probably the widest they can accomodate without having too many pedalling issues. The extra width, and bag jutting out would probably create some standover heigh issues too. It's cool though, and I definitely want to try one out.