I'm very similar to this. The biggest thing I carry with me is a one year old. For myself I have only pocket essentials, which gets complicated when I have no pockets :P. Then a a pretty basic diaper bag setup for the baby, perhaps including a sippy cup and bib if we're eating out and I remember. The 4 year old usually doesn't need anything for short trips, maybe a water bottle for longer trips. I guess we travel fairly light, but the kid corralling leaves me short of wits for stuff corralling.