The 1-star gear licence has one of the possible items it can be used as Modular Backpack. However as it is now an Epic tier item you cannot use the licence on it. Either the item description is wrong or the allowed list is wrong.
Steps to reproduce:
1. Get 1-Star Gear Licence (PERM)
2. Get Modular Backpack from Premium mystery case (7D)
3. Try to use them on each other
Possible item list: http://i.imgur.com/lYDv52J.jpg
Gear licence menu: http://i.imgur.com/tCxEzHD.jpg