Peak Design Outdoor Backpack Zip 18LA compact and lightweight frameless daypack ideal for day hikes, hydration, and commuting, the Outdoor Backpack 18L has all the comfort and versatility of our larger packs, but with a simplified design and aesthetic that feels at home on or off the trail. Designed to work seamlessly with Peak Design's wide array of Packing Tools*, which let you dial in your protection and organization for any gearincluding your camera equipment.