Han Solo's black vest has what look like four pockets on the top of its back. That seems somewhat unpractical, because those pockets are hard to reach without removing the vest. In the spirit of the older question "What purpose does Chewbacca's belt serve?", what does Han have in his pocketses?
Han wears this same black vest for example in The New Hope when he bargains with Jabba, and in The Jedi Returns when he fights on the forest moon of Endor.
(This question was originally asked by Knick in the context of the Darths & Droids universe, but my question is about the Star Wars films. Thanks to Valorum, who provided the screen cap above.)