Free Diver's prefer a long powerful fin to get maximum thrust and glide, this requires a longer than normal fin which will not fit in the standard gear bags used in diving. The Blue reef X-Long Backpack Bag is designed just for this, its extra long 37" length and10" width allows most of the longer Free Diving Fins to fit nicely. Bag is also a backpack style for ease of transport with its shoulder straps. Bag also has mesh bottom for rapped drainage.