Pullups are cute, but they can only hold so much. They aren’t really up to taking the load from an adult woman’s diaper.
In this video Nikko is wearing a pullup style diaper under her pants. Desperate to pee, she makes the decision to let it all go at once into her pullup. The results are predictable- The pullup overflows, soaking her pants. You can see her pants grow wet as her pee escapes around the sides of the diaper.
After she finishes peeing she finds herself standing in a puddle, pants soaked, wearing a saturated pullup. She takes off her wet pants and takes a minute to show off her wet diaper.