We also consulted with Sarah Lloyd, a physical therapist and director of scientific education at Spear Physical Therapy, for expert advice regarding how to choose a comfortable backpack and don it ergonomically. A zipper runs around 3 sides of the backpack, enabling the pack to open like a suitcase—a feature https://socialicus.com/story3070236/the-2-minute-rule-for-backpacks-eastsport