Universal backpack: The Osprey KESTREL 48 M/L is ideal for trips in all types of weather. The raincoat can be found in a zipper pocket at the bottom of the backpack. The AirScape™ backpanel delivers excellent ventilation in hot weather.If you’re going trekking, you’ll love the Stow-on-the-Go System™ for attaching poles. This pack has side access to the main zipper compartment and a large side zipper pocket. The backpack is compatible with a water bladder