The Aquifer 24 Backpack is Marmot's largest hydration packs designed for hikers and climbers. Its large main compartment stores enough gear for trad racks, trail essentials, or climbing ropes. The included 3L Hydrapak Shape Shift reservoir hangs from the clip, while a port lets you access the reservoir's tube on the approach. For comfort, Marmot added a ventilated Convective Airflow back panel and a tubular aluminum frame for support. The roll top closure offers more security and weather protection compared to backpacks with standard closures.