The source fuse 12l hydration backpack our mid volume pack keeps you light on the trail offering a 3l100oz widepac hydration system along with 12l of cargo space in three separate compartments including a padded pouch to protect your mobile the structured padded back design facilitates back ventilation source fuse 12l hydration backpack features 3l100oz widepac hydration system ightweight fabrics padded shoulder straps adjustable sternum belt with integrated w