The titanium material frequently used for solo gear is designed as a double wall structure; the products are made in a variety of sizes to enable easy stacking. They are designed for easy grasping without handles. The H450 Seppou Stacking Mug is the third of the five tall H-series mugs.  The H300 or the M200 can nest in it.  It nests in the H600 or the M400.  In addition, the H450 can be stored inside the Snow Peak Solo Cooker or the Trek 700.