If the Travel Kit was not enough then the Advance Travel Kit should do the trick. With a durable nylon exterior, it can help repel water, good for those rainy days.
The middle case has a large compartment that can hold most of your toiletries, cosmetics, diapers, bottles, and any other items you may need. In addition, the attached hook gives the option to hang and secure the bag on a handle, if needed.
The side cases gives extra spaces for items. All cases are lined with waterproof PVC material to aid with leaks and spills.