Women can’t shove enough stuff in their purses, and guys can’t shove enough crap in their backpacks. What you need is something with more capacity on the inside. Like this TARDIS backpack. It will hold all of your stuff, and probably a small timelord and his companion.
The entire bag is hand made out of a royal blue vinyl fabric and lined with a silvery-grey fabric. It measures 7 inches by 11 inches in size. This thing looks amazing. I would totally wear it everywhere until I ran into the Master carrying his TARDIS backpack. Then we would fight until one of us regenerated. With two clip-on backpack straps, it can also be used as a handbag.
It sells for about $175(USD) over on The Mad Boy with a Box’s Etsy shop.