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Alpinestars Hydro Pack The Hydro Pack is a comfortable, non-intrusive water carrier ergonomically designed to offer a close, low profile fit on the rider. HYDRO PACK HIGHLIGHTS: • Water resistant fabric combination of 840D ballistic nylon twill and 420D honeycomb nylon with abrasion resistant qualities for durability. • Reflective piping and logo screen prints for visibility. • Dedicated hydration compartment with premium 2 liter anti-bacterial reservior included. Drinking tube is ergonomically positioned for easy drinking; drinking valve has handy locking system that securely shuts off water flow. • Easy access to reservoir for quick installation and removal. • Small external side pockets to carry extras. • Padded air mesh back and straps for comfort. • Sternum strap for security.