According to the UNT Super Pit Bag Policy, you're allowed to bring in small bags, like purses or backpacks, as long as they're not too big. They have to be smaller than 12x12x6 inches, which is roughly the size of a lunchbox. Anything bigger than that, and you'll have to leave it at home or check it at the door.
But here's the quirky part: diaper bags are actually exempt from the size limit! That's right, if you're a parent, you can bring in a bigger bag to carry all your baby's essentials. It's a nice touch, and shows that the university is family-friendly.