titanium double wall stacking mug h series Size:450 ml slim profile adds elegance to Size:2.9L slim profile adds elegance to your table but will also fit easily in the door of your refrigerator That’s why we think this 61 These attractive stacking mugs are made of Japanese titanium using a historic manufacturing process and are ideal for enjoying hot or cold drinks in the great outdoors – whether you’ve taken a flask out to the forest They submit all of their outdoor hard goods to the highest standards of engineering and testing to ensure long lasting durability in even the most challenging outdoor conditions