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Ultralight and durable 18L daypack with a customizable fit. The Aerios 18 Backpack has a patent-pending interchangeable harness system that allows you to finetune your fit before you start your hike, so you won’t spend every step thinking about your pack. The ultralight, ultra-strong grid pack fabric sheds light rain and stands up to all the drops, drags, and snags a pack encounters on the trail. What's been updated: Updated with a FC0 DWR finish for a lower footprint. Full Product Features Technical features - Lightweight - Durable - Water repellent Construction - Proprietary Hadron® LCP (Liquid Crystal Polymer) grid face fabric is incredibly light and exceptionally durable with abrasion resistance rivalling fabrics twice its weight Fabric treatment - FC0 DWR (Durable Water Repellent) finish repels moisture and is PFAS-free Logos & Label configuration - Arc'teryx word logo - Arc'teryx Bird logo Pack attachment configuration - Two trekking pole attachment points Pack compression strap configuration - Front bungee compression system and webbing daisy chain provide external carry options Pack dimensions - Length: 49cm, Width: 24cm, Depth: 19cm, Volume: 18L Pack hydration - Hydration port allows for ease of tube passage outside of main compartment - Reservoir clip in bladder compatible inside of main compartment Pack pocket configuration - Internal security pocket with key clip - Top pocket - Two side pockets - Highly breathable shoulder harness with two zippered pockets that accommodate 500mL soft flasks or devices Pack suspension configuration - Adjustable sternum strap and removable waist belt - Interchangeable harness system available in two sizes for a precise fit across a wide range of body types - Patent-pending two-point harness adjustment system works at top and bottom for optimal pocket positioning and fit - Highly breathable AeroForm back panel and anti-barreling frame sheet enhance carrying comfort Sustainability - PFAS (Per- and polyfluoroalkyl substances) Compliant Materials - Body: 210d Cordura nylon 6,6 w/ 6.5 twisted 200d Vectran grid, 165gsm w/DWR - 93% Nylon, 7% Polyarylate - Body: Powernet 240g, 200gsm - 72% Nylon, 28% Elastane - Lining: 200d polyester lining, back: 20gr PU coated w/FC0 DWR, 108 gsm - 100% Polyester - Origin of fabric: KOREA - Origin of dying: KOREA - May release plastic microfibres into the environment when washing