An elastic sling system to avoid losing tools when climbing on rock or ice. This solves the problem for climbers who love climbing without a leash. The Single Spring is attached to the harness by looping it through the tape ring over the harness itself. The small carabiner is hooked onto the hole on the axes head when using it to lean on when walking or through the hole on the spike when holding the shaft in traction. In both cases it is impossible to lose the axe. The system allows the climber to swap hands easily without interference thanks to its compactness and the arm can be extended to its limit thanks to its elasticity. Compact when required, long when required.