Jack wolfskin acs hike 22 backpack ladies the ladies jack wolfskin acs hike 22 backpack is perfect for taking on energetic hikes designed with a spacious 22 litre capacity in the main compartment along with additional zipped pockets across the outer so you can ensure you have all your essentials with you this jack wolfskin backpack also features an hydration pack system along with the acs system to the back to help keep your back well ventilated and comfortable completed with the jack wolfs