The Back-Up Mask (& Snorkel) Package (BUMP) is the perfect back-up set to go along with your IDM. 

Safety when diving is a primary concern for OCEAN REEF.

That is why we put together a backup bailing system made of a comfortable conventional mask with a fabric strap for easy and quick donning, a flexible, semi-dry snorkel, and a tough pouch where you can fit the mask, the rolling snorkel and hang it on your BCD or on your belt thanks to the 2 D rings and belt loop.