Built of rugged 100% recycled nylon. Highly breathable Regulator® airmesh shoulder straps and hip belt. Suspended mesh back-panel construction provides excellent airflow and prevents moisture buildup for all-day comfort. On-the-go accessible hip belt and side pockets secure small items while on the move. Sleeve can hold gear and is also hydration compatible. Rain cover included. Lid and internal security pockets zip to keep items safe. Features Made of Recycled Materials Comfortable Shoulder Straps Back Panel Engineered for All-Day Wear Versatile Hip Belt Hydration Compatible Handy Cover Zippered Pockets Made in Vietnam 477 g (1 lb) Materials Shell: 4-oz 140-denier 100% recycled nylon ripstopBoot: 4.1-oz 210-denier 100% recycled nylon ripstopRain cover: 2.2-oz 100% recycled polyester taffetaAll with a PU coating and a PFC-free DWR finish (durable water repellent coating that does not contain perfluorinated chemicals)Back panel and straps: 100% polyester meshStretch-mesh pockets: 9.4-oz 66% nylon/34% spandexLining: 3-oz 200-denier 100% recycled polyester with a PU coating Note 477 g (1 lb)45,7 cm x 23,5 cm x 21,6 cm (18" x 9.25" x 8.5")14L (854 cu in) Patagonia, Altvia Pack 14L