The Sylva 12 features our AirSpeed™ backsystem and a LightWire™ frame, taking ventilation to the next level, while featuring an innovative open-yoke to promote maximum airflow along the back. Equipped with a ventilated performance-fit BioStretch™ harness to further increase airflow; even on the hottest rides, hikes or trails, you'll enjoy incredible ventilation and load stability.A tensioned mesh backpanel provides the ultimate ventilated carryA bike-specific winged shoulder harness creates comfort and stabilityBecause rain or shine, there's no excuse to not get a ride in; Stores in a zippered pocket at the base of the pack and made with bluesign approved fabrics and DWR treatments made without PFASSyncro/Sylva is designed to provide a body-specific fit to achieve maximum comfort and stability across body types; Packs designated as Women’s are best suited for shorter, narrower, curved body types compared to packs designated as Men’s+ bluesign approved main body and bottom fabrics + GRS-certified 100% recycled main body and bottom fabrics + All DWR treatments made without PFAS + BPA-free reservoir