Our invention creates portable adjustable boundary lines for any ground surface. These boundary lines create portable adjustable fields, by attaching the webbing lines to lightweight sandbags that can be laid out by anyone on any desired playing surface. Any coach, player, or parent can use this invention to establish a field, a training grid, or a playing area for any sport such as, but not limited to, soccer, football, volleyball, basketball, lacrosse, hockey and baseball. These fields can be created on any ground surface such as grass, synthetic or artificial turf, indoor gymnasium, asphalt, concrete and sand.