Beuchat Cray Sling.

Free diving for crays and don't tow a large storage float?  Well just clip this Cray sling from your float and it's there if you need it.

Almost zero drag when you are towing it.  When you do catch a legal crayfish, put the tail carefully through one of the 6 loops and gently tighten it to prevent it from escaping, but not too tightly that you will inflict damage or pain.

The crays will "happily" hang under the float for the rest of your dive.