Osprey’s Hydraulics® Reservoir by Hydrapak is ideal for large volume packs and long duration activities

Classic steel square bars with black polymer coating

Frame constructed from advanced alloy DAC aluminum poles

Need an adapter

21 oz Standard Mouth Bottle wax stiff nylon brush Osprey’s Hydraulics® Reservoir by HydrapakHydro Flask 21 oz Standard Mouth Bottle: 21oz is the perfect go anywhere companion on your busiest days. It stashes easily in a small shoulder bag, your pack's side pocket or your car cup holder, and holds enough to keep you going for hours without weighing you down. The 21 oz Standard Mouth is one of Hydro Flask's best selling vacuum insulated water bottles because of it's size and versatility. Details: Easy to Transport Versatile, middle of the road