I have used the ebags Piazza day bag which is a crossbody bag. I did find this to get somewhat heavy so I needed to mindful of what i put it in. It did have a lot of pockets and and expandable water bottle pocket which was convenient.
I also have the bagalinni backpack which i like. We still use a stroller so I would pack all the things we might need for the day in here and throw it in the bottom of the stroller. I then used the vera bradley little hipster to hold on the valuables. It is small and very light weight. I kept money, credit cards, camera and a few wipes as well as a small thing of sunscreen and chapstick in here. I like that it was small and lightweight and I couldn't put a lot in it so most of the time i barely noticed I was wearing it.