Hario's Heat Resistant Glass Flask Stocker Medium is much like a laboratory measuring cup, however, the design differs slightly. Constructed with heat-resistant glass, this flask makes for an ideal storage tool for kitchen staples such as nuts, pepper, and much more. Use this flask for not only storage, but also mixing liquids. It features an olive wood lid and a silicon rubber seal to ensure an airtight closure, so stored items are kept fresh for longer.