The Salomon XA 15 Multisport Fastpack/Backpack gives you easy access to all your essentials especially hydration and 15l of storage ideal for ultra-trails, long bike rides and mini expeditions. Breathable and fast drying, the fabrics offer lasting comfort. Made with durable, weather-resistant, quick-drying 82% Polyamide, 18% Polyethylene fabric. Sensifit uses stretch, breathable fabrics that conform to the body, and lightweight adjustments for fit and stability. The pack doesn't bounce but allows comfortable breathing. The Sternum strap construction allows you to adjust and connect your pack quickly, even on the fly. The straps and back-pad are thermo molded and sculpted to fit your spine and shoulders, ensuring all day comfort and support on the trail. MotionFit suspension system stretches around your body, holding the load stably while letting you move. The stash pocket is ideal for storing everything you need during the day and the adaptable gear carrier for any equipment. Sizing (Chest): S/M: 34-39”, M/L: 39-43”