Primus trailbreak ex vacuum flask 10l description rugged expedition bottle trailbreak ex vacuum insulated bottles are made from high grade stainless steel making them rugged and durable a silicone sleeve improves the grip and prevents cold fingers or possibly frostbite in case you would touch the steel in very cold conditions it also offers extra protection to the bottle the cup is made from double walled stainless steel to keep the beverage hot or cold and also serves as extra protection