A portable net device for stopping the flight of projectiles such as golf balls comprises a coilable main member and a coilable base member respectively formed in closed loops, a main sleeve substantially covering the coilable main member wherein the main sleeve has a top hole and a main node cross-opposing the top hole, a fabric portion radially extending from the main sleeve for flexibly stopping the flight of projectiles such as golf balls, a base sleeve substantially covering the coilable base member wherein the base sleeve has a bottom hole and a base node cross-opposing the bottom hole, and a means for supporting the main member at a substantially erected position.