Our burliest medium-to-large capacity water storage and delivery systems. Completely collapsible for superior packing efficiency, our burliest medium-to-large capacity water storage and delivery systems are perfect for everything from alpine- to road warrior-style expeditions. Armed with incredibly tough 1,000-Denier exteriors and now laminated with an improved BPA-free food-grade lining for better-tasting water, these bags can handle freezing and the abuse inflicted by expedition crews and hardcore adventurers. Our Hydration Kit accessory adds do-all versatility, and the new svelte 3-in-1 cap lets you fill, drink and pour with greater ease. Heavy-Duty: Abrasion-resistant 1,000D fabric, laminated with food-grade polyurethane, can handle everything from freezing to boiling. Versatile: Low-profile 3-in-1 cap lets you fill, drink and pour with ease. No-Hassle Attachment: Perimeter webbing allows for easy carrying and hanging. Safe Drinking: BPA-free. 4L 6L 10L Weight (Standard) 6.9 oz 8.7 oz 10 oz Weight (Metric) 0.20 kg 0.25 kg 0.28 kg Width (Standard) 10 in 11.3 in 12.5 kg Width (Metric) 25.4 cm 28.7 cm 31.75 cm Length (Standard) 18.3 in 20.6 in 23 in Length (Metric) 46.5 cm 52.3 cm 58.4 cm Material(s) PU PU PU Country of Origin USA USA USA