Add Functionality for More Fun: Backpack Hip & Chest Straps As Well As Laptop Protector Pouch. : 5 Steps - Instructables
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Amazon.com : Wisdompro Backpack Chest Strap, 3/4 inch Backpack Sternum Strap Chest Belt with Quick Release Buckle for Hiking and Jogging (Compatible with 1 inch Webbing Shoulder Strap) : Sports & Outdoors