Very nice size. I put a small water bottle inside and a small snack when I take my baby to the park. On top of the water and snack, I fit my keys, 6.3-inch phone, and cards, and I still have room. It has gotten a lot of nice comments from people and I really enjoy using it a lot. I would purchase another one of SoJourner's fanny packs in a heartbeat. I even feel safer when going out with my baby as I do not have to be shuffling through a bag and holding him.