Start with 10-by-12 inch plastic shopping bags. Remove handles. Lay bag flat. Use a grommet tool and hammer to fix two grommets near bottom and one near top center, as shown. A hole punch will work, too.
Thread a 1-inch-wide-by-54-inch-long shoelace through each bottom grommet. Pass both laces through the top grommet; knot all laces on inside of bag to secure. Close top with Velcro dots; edge with bright hazard tape.
10-by-12 inch plastic shopping bags
Grommet tool and hammer
If the skater you love is about to celebrate a birthday, throw an awesome party at a skate park.