We have made the round centre compartment to have an individual silicone lid that allows for a more leakproof experience - holding thick liquids like yogurt, sauces, and dips. Water or juice are not recommended.
The other compartments have a shared top lid that's flat with an outer ridge that helps seal its contents in place, however, they are not meant for carrying overly liquid items.
Your Munchebox is not meant to be submerged in water.