Deuter Streamer Thermo Bag Nylon / Ripstop EFFECTIVE - Made from insulating thermo-material with a reflective foil liner, this sleeve helps maintain the temperature of the your hydration systems contents regardless of the weather; Ideal for year-round use VERSATILE - Thermo Bag can be carried either inside or outside your pack; Also suitable for insulating bottled beverages and food EASY TO USE - The Thermo Bag features a wide zip opening that makes it convenient to take your reservoir in and out of the insulation sleeve COMPATIBLE - Compatible with Deuters Streamer 2.0 and 3.0 hydration reservoirs SPECS - The 3-liter Thermo Bag measures 18 x 10 x 1 in and weighs 4.2 oz. Exterior is durable, abrasion resistant Microrip-Nylon.