The air-tight seal of a waterproof case will trap the air's natural humidity inside the case. This can cause the creation of condensation droplets inside the case. It is highly recommended that a dehumidifying agent, such as these desiccant packets, be used when any electronic items are kept inside the waterproof and air-tight case.
Desiccant is a high-absorption dehumidifying agent. Made with natural ingredients, each packet is environment-friendly, as they are re-usable and completely degradable. They can be dried with a quick trip through the micro-wave, and re-used multiple times.