The Peak Aspiration is Aarn's take on traditional-style backpacks but with all the technologies that make the packs incredibly comfortable and so enjoyable to wear.   With a fully customizable fit and a free-movement harness system, the pack moves as you move. You can be sure that you will be looking forward to putting your pack on and also making others on the trail jealous. The Peak Aspiration is designed with tougher fabric and plenty of features so it can become your trusty companion for all kinds of adventures. With it, you will feel ready to tackle the longest trails, the highest peaks, or the most acrobatic dance moves!  Add some Balance pockets (not included) to embrace the full benefits of our energy-saving and strain-free Balance System.  Add Balance Pockets for natural balance, pain relief and load-carrying efficiency. Choose the specific Balance Pockets, Bags or Racks that match your activity and volume requirements. The Stronglites have proven themselves in the roughest backcountry and on the world's highest mountains. Back Length Range Small: 39cm - 45cm or 15in - 17in Medium: 43cm - 53cm or 17in - 21in Long: 53cm - 57cm or 21in - 22in Features U-Flow Shoulder Harness:    Breathable stretch 3D mesh that auto-moulds to the natural slope of your shoulders.    U-Flow bottom tensioners allow free movement of the shoulders while ensuring optimal pack stability, reducing the buildup of fatigue.    Double foam layer is used over the collarbones for added comfort.    Back length adjustable while wearing the pack so it always feels just right.   Dynamic Pelvic-Form Hip belt:    Dual-adjust hip belt tensioning system allows for fine-tuning of the hip belt.   Hip belt angle is micro-adjustable to allow a perfect match to your pelvic shape.    Quick-release buckle allows you to easily unclip the belt with one hand.    U-Flow system ensures that the hip belt rotates from side to side and pivots front and back, following your natural movements.    The breathable 3D mesh used on the upper part of the hip belt wraps perfectly over the top of your iliac crest, offering superior comfort and support for long hours on the move.      Suspended back panel:   Auto-moulds to your back shape.    Maintains an air gap for back ventilation keeping you cool and dry.  Additional features:      Slim side profile to reduce the backward pull on the shoulders.    Extendable and removable lid which doubles as a bum bag.   One front and two side stretch pockets.   Front compression web and drawcord to secure some extra gear and compress your pack down.   Two trekking pole attachments at the back and two quick-stow at the front of the pack.    Two ice axe attachments.   Water-resistant liner.   Hydration exit and attachment loop.   Built-in attachments for skis, snowboards, and snowshoes.    Specifications Volume (Litres): 50 (small) 55 (medium) 60 (large) Weight (kg): 1420 grams + liner (small) 1460 grams + liner (medium) 1510 grams + liner (large) Load to: 17 kg (Increase by using Balance Pockets or Balance Bags) Fabrics Main: 500D Nylon Kodra & 100D Robic Bottom: 210D Robic Gridstop with UHMWPE  Liner: 190T Nylon  Dimensions  Short back: W 37cm D 22cm H 62cm  Medium back: W 37cm D 22cm H 67cm  Max Load: 17kg or 37.4lbs  Removable waterproof liner included. Aarn Balance Pockets: Optional extra.