The Osprey Siskin 12L Backpack has one goal- to keep us riding in comfort. The Atilon foam framesheet helps distribute our load evenly across our body while the AirScape backpanel provides excellent airflow between our back and the pack to keep us cooler and drier. Osprey included its Hydraulics LT 2. 5L Reservoir to ensure that we can carry plenty of water on our ride with a bladder that fits perfectly into a dedicated hydration compartment. The U-zip main compartment opens into a large, internal organizational pocket with mesh compartments to store our tools, layer, snacks, and other gear. On the outside, we like the accessible hip belt pockets, the no-scratch sunglass pocket, the LidLock helmet attachment, and compression straps that can tighten down our load or carry a full face helmet.