Perfect for day hikes, the Nitron adds just 560 grams to your loada solid number for an 18-liter backpack! All unnecessary frills have been stripped away, going for a more minimalist design. *The main image displays the colour youre about to add to the shopping cart. Images showing details, display another colour. The flexible dual sternum strap and vest-like carrying system are familiar features from trail running packsand Nitron is well-suited for brisk movement too. The chest strap includes a safety whistle, which is not only a sensible thing to carry around but also a required piece of equipment in many trail running races and events - Air Contour back panel and body-conforming structure - Two back lengths - 48 cm - Internal compartment fits up to a 3L hydration bladder (sold separately) - One shoulder strap has a pocket for a soft flask (sold separately) - The other shoulder strap has a zippered pocket, e.g., for a phone - Main compartment opens with a zipper