Guerrilla Packs Roundhouse Internal Frame Backpack, Middle Grey/Dark Grey 3,661 cubic inch capacity (50 liter internal frame backpack with 10 liter detachable daypack and top lid) Tension-mesh suspension system for added back support and increased ventilation Side and top loading design Features: reinforced top grip handle, compression straps, accessory mounts, rain cover and hydration compatible Torso fit range: 15-Inch to 22-Inch