I've been using these hot buttons for the longest time and can't remember who created it originally. If you recognize the work let me know where I can find the original creator with a link to their ui so I can give proper credit.
Needless to say I just edited it a little so the two extra bag slots are in the #1 hot button window. I also made the buttons the same size as the buttons you will find on #2, #3 and #4 (they were slightly smaller originally). I'm not one for the clickies added since I have those in my Pet Window.