A soap holder is essential for keeping your soap clean and dry while traveling on the Camino. Choose a lightweight, durable holder made of plastic or silicone that can securely contain your soap bar. Look for a design with drainage holes or a ventilated bottom to allow the soap to dry between uses, preventing it from becoming mushy. A compact size ensures it fits easily into your toiletries bag. Opt for a holder with a secure, snap-on lid to prevent leaks and keep your soap free from dirt and contaminants.