The North Face Borealis Backpack Our best-selling 25-liter women's pack gets a reboot with improved organization and an upgraded suspension system The women-specific FlexVentTM suspension system boasts custom injection-molded shoulder straps, a padded mesh back panel with a spine channel that's specifically shaped for an ergonomic fit and a wicking lumbar panel for maximum support and ventilation Women-specific shoulder straps are contoured to fit a woman's smaller frame