The Cressi long-fin gear bag is intended to accommodate the extra blade length of freediving fins. A narrow, elongated bag can be easier to carry than packing long blades diagonally through a general scuba duffel. The supplied listing also describes space for a mask and snorkel, a zip closure and a shoulder strap.
The selected long-fin bag is listed at 94 × 25 cm, approximately 37 × 10 inches, with a shoulder strap and zip closure.
Measure the complete fins, including foot pockets, and compare them with the bag's usable interior length. Long-fin models vary, so a freediving label alone doesn't guarantee your pair will fit. Protect the mask separately and avoid placing hard accessories where they can press against thin fin blades.
Check whether your chosen version is ventilated and follow its drying instructions. Wet fins and a zipped fabric bag should be unpacked after transport. Choose this bag around your actual fin dimensions and preferred carrying position, with the rest of the scuba kit packed separately if necessary.