From left, Beth Daniels, instructor of occupational therapy, and OT student Jordan Schefman weigh fifth-grader Andrew Loftus’ backpack to determine if it’s too heavy. On Sept. 24 — National Backpack Awareness Day — occupational therapists demonstrated to students at Sappington Elementary School the proper way to carry backpacks and how much weight is appropriate for kids to carry. Last year, more than 7,000 children were injured due to overloaded backpacks.