there are more specialized fins

choose a full sock or reassess the foot pocket size

Enhanced storage capacity with front pocket for small gear

especially in the pool

but foot length is more reliable than shoe size alone

Double K - System One Diving Backpack Bi-Fins there are more specialized finsDouble K System One Diving Backpack PRE ORDER NOW! (delivery ~ end. August) The Double K System One Diving Backpack is a large, stylish freediving gear backpack for divers who want to carry fins, wetsuits, masks, snorkels and accessories in one clean setup. This is not a small daypack and not a basic mesh bag. The System One is designed as a high capacity diving backpack with enough space for serious freediving equipment including up to two full sets