A bag that helps to protect the back. Patented curved underside helps to spread the loads. Ergonomic carrying straps. Lightweight profiled back panel for improved ventilation. Suitable for print and embroidery. For every bag sold a contribution goes to Backcare, the charity researching children's back health.Small - 16" (h) x 12" (w) 5.5" (d) - 17 LitresLarge - 20" (h) x 14" (w) x 7" (d) - 32 Litres