What about a 3 x 1 in order to have a bag and a backpack at the same time?
This is a handbag with long shoulder straps and can be a backpack with adjustable straps.
There are 3 inner compartments (one is zippered), a carabiner to hang your keys and a rear zippered pocket to have your phone on hand!
Now you just have to combine the fabrics 😉 Below there are the available sailcloth colours and the lining fabrics aswell. How are you going to combine them?