Your mask is your window to the exciting and wonderous underwater world. Without it, your snorkeling adventure is ruined. In essence it is an investment in your snorkeling vacation and you need to protect that investment with this protective Aqua Lung Mask Box. The box is made of a heavy plastic with two plastic snaps and hinge to help keep the mask box closed. This is a great way to protect your mask during travel and even while it is in your snorkeling equipment bag. The Aqua Lung Mask Box is definitely suggested for those whose masks have prescription lenses. Snorkelers have been known to buy more than one because it is also great for carrying little snorkeling accessories and necessities such and spare snorkel equipment parts, extra cash and keys. Protect your window to the underwater world, you'll be glad you did. The Aqua Lung Mask Box pictured is similar but may not match exactly.