Hydration Compatible - these are bags and packs that are hydration bladder compatible. They have special outlets and sleeves to allow for a bladder and tube. The shoulder straps also have attachments to secure the tube while moving.
Features reflective detailing in the form of trim, logos or toggles, to enhance the nighttime safety of the wearer. A valuable feature on running and cycle jackets in particular.
Water Bottle Pocket - Features one or more pockets for water bottles, allowing easy access to fluids at all times, without the need to rummage in the main compartment of the rucksack.