Never used. Osprey makes the highest quality packs from the highest quality materials. This pack has a 5 liter total volume with a 2.5 liter hydration reservoir. Wide mesh panel keeps your back ventilated. nice padded backpack straps. Ideal for an all day hike or bike ride -- the bright red fabric protects you on the road. Interior organizer pockets. Includes a rain cover. I paid $120 for this and it retails for anywhere from $145-170 today.