evo.com | Arc'teryx Day Packs > Climbers know that summit packs need to be dead simple and totally reliable, which is exactly the philosophy behind the Arc'teryx Heliad 15 Backpack. This 15-liter multitasker moves seamlessly from office commutes to weekend travel to spontaneous trail missions without missing a beat. Adjustable Shoulder Straps Main Compartment with Internal Zippered Security Pocket Body 100D SD Cordura nylon 6,6 dobby, DWR FC0, 120gsm - 100% Nylon Volume 15L 44.3cm Length x 27cm Width x 20cm Depth | Arc'teryx Heliad 15L Backpack 2027 | Nylon