The Primus Trailbreak Vacuum Bottle is a slightly tapered shape that makes the flask easier to slide into your backpack and is also safer to grip. Just like Primus' other vacuum bottles, the trailbreak is a double walled flask with vacuum insulation. It is made of high quality stainless steel, is extremely durable, and is great for all sorts of adventures. The stainless steel has no treatment on the inside, so the taste of the content is not effected. The cup is also made from double walled stainless steel to keep the beverage hot or cold, with a large opening making it easy to fill and clean. The bottle comes with two stoppers. One regular, and one ClickClose stopper that makes it possible to drink directly from the bottle.