I have OCD, so the contents of my adventure pouch need to be nearly symmetrical. xp Well anyways, in the top slot, I have my divine shield (I upgraded to the Goddess Shield, but the art of the goddess is ugly, in my opinion, and I do not want her on my shield, so I got rid of it xD). I'll probably eventually get the Hylian Shield, but as far as I'm concerned, I like my Divine Shield.
I carry all four of my bottles with me, and have them in each of the diagonal slots. Three of the four hold fairies just in case, and the last one is typically empty for my own use depending on the situation.
On the left slot, I carry the Heart Medal; on the right is the Treasure Medal. And I almost always leave the bottom slot empty, so that if I need to add something to my adventure pouch, that I don't have to swap it out with something else.
That's what I'm carrying around most of the time when I'm exploring and doing sidequests now, since I've already beaten the game. It varied slightly for dungeons, but yeah.