Stash the Arc'teryx Index 15 Backpack in your luggage when you need a small daypack for traveling, or use it as a lightweight everyday pack when you're living life at home. The Index has a simple design that includes a zippered top-loading main compartment, a front pocket that the whole pack can be stuffed inside for easy carrying, and an internal stash pocket that holds a hydration reservoir when you're hoofing it through town or a tablet when you're riding the train into work.