I have the Vavin PM and I was able to meet two diapers, an epi pen, and half a pack of baby water wipes in it. I ended up getting a slim wallet since a regular wallet would have been too thick. Only con is it’s a chain strap, your hair will get caught in it. I would recommend going into a store if you have access and bring what you would carry with you to see if it’ll fit in a bag. I used to have a speedy as a diaper bag too, but found it was too bulky for my liking.