Purse/Diaper bags

Li

Does anyone have any recommendations on a bag that can be used as a purse but has enough room to put in a bottle, few diapers... I don't want to have to bring in my regular bag to the grocery store and stuff. I'd rather just have a few essentials along with my wallet, phone, and keys. I like long straps so it can be worn cross body. I don't want to worry about it slipping off my shoulder while trying to carry the car seat. Thanks!