Anyone na frequent flyer of Cebu Pacific?

Hi everyone! First time ko magtravel with check-in luggage. I have a 29-inch luggage and planning to just put whatever I can bring inside. Ofcourse, as long as allowed in a chek-in baggage.

Question: Do they really weigh the check-in baggage if local flight (Iloilo)? Or as long as your baggage doesn't have the unusual size, okay lang biskan more than 20kg? Because what I usually see is passengers have a hand-carry luggage which I think weighs more than 7kg, then they also have backpacks, and they're allowed to board gyapon.

Thank you.