I ran across some pictures of a few early porteur bag prototypes in testing. Thought I'd share them.
There's a few things on these that were laid by the wayside because I found they weren't working. The double flap for one: to bulky and akward. This got solved with a combo of the drawstring liner and flap velcro extensions (I felt really proud of myself when I thought of the extension method.) Notice also the messenger bag style strap in some early models... I quickly figured out how akward this is with bag that has corners with a tendency for definition.