How do you carry small things on the Mundo?

The Mundo's rear carrier doesn't have pockets. It's just a chassis that's ready for you to customize for your carrying needs. In order to carry small things like notebooks, fruit, toothbrush, etc., you'll need to bring a backpack or messenger bag and strap that to the Mundo using cam straps or bungees. One of the nice things about using a messenger bag is that many of them are inherently waterproof, constructed of a vinyl lined nylon fabric. So waterproofing your gear on your cargo bike could be as simple as using the bags you already own.