HydraHike running waist packs have an adjustable hip belt to help secure the pack around your waist, adjust these straps to fit your size, light enough to use as a kids' pack. This waist pack features reflective details which help keep you safe while out in the dark, HydraHike is the perfect camping wasit pack. Large main compartment. High Sierra features a comfortable, ergonomic design, padded back panel with air mesh material help keep you comfortable and dry.