Felt Sport-e 95 bike rack and quick-release bracket uses a four-point bayonet system distributed as a universal mounting plate to which a pouch or bucket can be attached. We will duplicate the bayonet system so as to make custom interchangeable platforms for loads we can now only imagine.
How about a growler carrier? I lost a growler once. It fell out of my lopsided pouch leaving beer and broken glass all over the bike path.
//scad.fed.wiki/assets/viewstl/viewstl.html?stl=http://scad.fed.wiki/assets/rack-bracket/rack-bracket.stl HEIGHT 370