I love the concept of Notabag — it’s a convergence of a reusable shopping bag and a backpack.
Companies like, most prominently, Apple, make convergence look easy, but I think it’s really difficult on any level. Things tend to get overly complicated, when merging the functionality of two objects really needs to be kept as simple as possible — think of how many ways you could merge a shopping bag and a backpack and how many ways it could turn into a disaster. Seeing this simple and really useful bag makes me happy. (I could totally use one for travel.)
Notabag is a Kickstarter project by Adnan Alicusic, so if you like it and would like to see it go into production, help fund their project here.