Climber and outdoor equipment manufacturer Yvon Chouinard started using tumplines in preference to a backpack to solve chronic back pains after seeing how Nepalese porters developed muscles down the sides of their spinal columns.
Climber and outdoor equipment manufacturer Yvon Chouinard substituted tumplines for a backpack in response to persistent back issues after noticing how Nepalese porters built muscle on the sides of their spines.