I disclose here a system of interchangeable surfcasting bags and surfcasting equipment storage units. A variety of storage units are selectively secured to a base bag, waist belt or shoulder strap by a standardized tandem locking means. An upper lock is engaged with a simple twist of even a wet, gloved hand. A lower, secondary, lower lock latches in place and ensures the storage unit remains attached to its base in the harshest conditions. Storage units have male twisting locks and latches. Base bags, waist belts or shoulder straps have corresponding female twisting locks and latches. A distancing tool template is provided to ensure consistent and standard distance between upper and lower lock and latch components on all system pieces at all times.
